# Opinion polling for the 2020 Taiwanese general election

This is a list of nationwide public opinion polls that have been conducted relating to the general election for the 2020 Taiwanese general election. The persons named in the polls are declared candidates or have received media speculation about their possible candidacy.

## Presidential election

Rating figures are in percentages.

### Polls with candidates

Han–Soong–Tsai
| Date | Pollster | Sample size | Han Kuo-yu KMT | James Soong PFP | Tsai Ing-wen DPP |
| 30 December 2019 | Green Party | 1,044 | 20.8 | 6 | 54.2 |
| 26 December 2019 | Formosa | 1,072 | 20.3 | 10.3 | 48.2 |
| 17 December 2019 | Green Party | 1,022 | 20.4 | 7.9 | 54.4 |
| 15 December 2019 | ETtoday | 1,074 | 18.1 | 9.9 | 56.5 |
| 14 December 2019 | United Daily | 1,110 | 22 | 9 | 48 |
| 11 December 2019 | Green Party | 1,021 | 15.47 | 4.66 | 53.2 |
| 8 December 2019 | ETtoday | 2,875 | 24.5 | 7.2 | 46.6 |
| 4 December 2019 | Green Party | 1,021 | 17.9 | 9.5 | 52.1 |
| 26 November 2019 | Formosa | 1,071 | 23.7 | 5.2 | 51.2 |
| 26 November 2019 | PinView | 2,192 | 23.6 | 6.5 | 40.9 |
| 25 November 2019 | ETtoday | 2,308 | 30.3 | 9.5 | 44.4 |
| 20 November 2019 | Green Party | 1,048 | 25.4 | 8.9 | 44.9 |
| 19 November 2019 | PinView | 2,157 | 25.0 | 6.9 | 41.6 |
| 18 November 2019 | Apple Daily | 1,084 | 24.0 | 6.0 | 42.3 |
| 12 November 2019 | Formosa | 1,070 | 27.5 | 10.0 | 40.5 |
Han–Tsai
| Date | Pollster | Sample size | Han Kuo-yu KMT | Tsai Ing-wen DPP |
| 26 November 2019 | PinView | 2,192 | 24.5 | 42.9 |
| 25 November 2019 | ETtoday | 2,308 | 32.0 | 45.6 |
| 19 November 2019 | PinView | 2,157 | 25.7 | 42.6 |
| 12 November 2019 | PinView | 2,172 | 25.1 | 41.2 |
| 12 November 2019 | Formosa | 1,070 | 31.4 | 49.0 |
| 7 November 2019 | ETtoday | 4,451 | 33.7 | 45.7 |
| 7 November 2019 | TVBS | 1,187 | 40 | 49 |
| 5 November 2019 | China Times | 1,120 | 25.9 | 37.8 |
| 5 November 2019 | PinView | 2,182 | 27.7 | 39.6 |
| 29 October 2019 | PinView | 2,149 | 25.1 | 40.3 |
| 29 October 2019 | Green Party | 1,112 | 32.8 | 44.3 |
| 26 October 2019 | United Daily | 1,204 | 30 | 42 |
| 23 October 2019 | TVBS | 1,209 | 39 | 52 |
| 22 October 2019 | PinView | 2,175 | 28.2 | 40.1 |
| 18 October 2019 | Formosa | 1,072 | 32.5 | 51.6 |
| 17 October 2019 | China Times | 1,109 | 24.1 | 34.4 |
| 16 October 2019 | Focus | 1,072 | 31.3 | 48.7 |
| 15 October 2019 | CNEWS | 1,153 | 27.3 | 43.3 |
| 15 October 2019 | PinView | 2,169 | 27.9 | 40.5 |
| 8 October 2019 | Green Party | 1,010 | 31.0 | 50.7 |
| 1 October 2019 | Green Party | 1,021 | 32.6 | 50.9 |
| 27 September 2019 | TVBS | 1,083 | 38 | 50 |
| 24 September 2019 | PinView | 2,167 | 25.9 | 40.3 |
| 24 September 2019 | Green Party | 2,167 | 34.5 | 48.8 |
| 22 September 2019 | Apple Daily | 2,167 | 32.9 | 44.4 |
| 21 September 2019 | Formosa | 1,085 | 33 | 45 |
| 20 September 2019 | United Daily | 1,154 | 37.3 | 45.5 |
| 20 September 2019 | CNews | 1,085 | 28.7 | 54.8 |
| 17 September 2019 | Green Party | 787 | 32.3 | 49.1 |
| 17 September 2019 | Formosa | 1,073 | 31.6 | 47.7 |
| 13 September 2019 | SETN | 1,075 | 35.2 | 48.1 |
| 13 September 2019 | China Times | 1,344 | 25.7 | 38.1 |
| 12 September 2019 | TVBS | 1,294 | 42 | 49 |
| 10 September 2019 | ETtoday | 3,302 | 27.1 | 43.4 |
| 9 September 2019 | Formosa | – | 25.4 | 57.2 |
| 24 August 2019 | TPOF | 1,085 | 34.7 | 52.1 |
| 22 July 2019 | TPOF | 1,089 | 40.1 | 45.0 |
| 22 July 2019 | China Times | 1,102 | 36.5 | 34.9 |
| 1 July 2019 | Apple Daily | 1,093 | 42.1 | 33.9 |
| 1 July 2019 | UDN | 1,087 | 43.0 | 38.0 |
| 25 Jun 2019 | Apple Daily | 1,076 | 38.8 | 40.6 |
| 24 Jun 2019 | TVBS | 1,674 | 36.0 | 50.0 |
| 19 Jun 2019 | Green Party | – | 32.7 | 46.0 |
| 18 Jun 2019 | Apple Daily | 1,086 | 40.1 | 40.6 |
| 1 Jun 2019 | CCS | 1,823 | 39.4 | 37.2 |
| 28 May 2019 | Formosa | 1,086 | 37.2 | 40.8 |
| 19 May 2019 | Apple Daily | 1,080 | 40.4 | 38.6 |
| 16 May 2019 | Fount Media | 1,075 | 46.2 | 38.3 |
| 15 May 2019 | United Daily | 1,103 | 44.0 | 38.0 |
| 13 May 2019 | EtToday | 2,875 | 43.7 | 33.7 |
| 11 May 2019 | Apple Daily | 1,077 | 42.4 | 37.4 |
| 8 May 2019 | TVBS | 951 | 50.0 | 38.0 |
| 30 April 2019 | China Times | 1,004 | 49.6 | 30.4 |
| 29 April 2019 | TVBS | 1,090 | 52.0 | 34.0 |
| 25 April 2019 | Formosa | 1,068 | 44.1 | 35.9 |
| 25 April 2019 | TVBS | 1,222 | 51.0 | 33.0 |
| 21 April 2019 | TPOF | 1,072 | 47.9 | 39.6 |
| 17 April 2019 | Formosa | 1,078 | 48.7 | 33.9 |
| 26 March 2019 | Formosa | 1,072 | 49.5 | 34.5 |
| 5 March 2019 | Fount Media | 1,077 | 54.9 | 31.6 |
| 20 February 2019 | TVBS | 1,382 | 54.0 | 25.0 |
| 16 February 2019 | Apple Daily | 1,087 | 52.5 | 33.4 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 48.7 | 32.3 |

### Polls with previous potential candidates

Ko–Han–Tsai
| Date | Pollster | Sample size | Ko Wen-je Ind. | Han Kuo-yu KMT | Tsai Ing-wen DPP |
| 9 September 2019 | Formosa | – | 21.0 | 19.7 | 44.1 |
| 24 August 2019 | TPOF | 1,085 | 22.6 | 28.7 | 41.3 |
| 9 July 2019 | ETtoday | 2,271 | 16.5 | 38.4 | 33.0 |
| 9 July 2019 | Trend poll | 3,000 | 23.8 | 41.7 | 21.5 |
| 9 July 2019 | Apple Daily | 3,019 | 23.0 | 36.3 | 22.8 |
| 8 July 2019 | You Media | 2,501 | 25.0 | 31.0 | 30.3 |
| 8 July 2019 | Landscape poll | 1,079 | 25.0 | 37.0 | 26.1 |
| 5 July 2019 | Trend poll | 1,283 | 25.0 | 38.4 | 25.5 |
| 4 July 2019 | TIP | 1,071 | 21.2 | 35.7 | 26.7 |
| 2 July 2019 | Green Party | 1,433 | 27.2 | 29.6 | 34.4 |
| 2 July 2019 | Apple Daily | 1,093 | 23.1 | 35.8 | 24.0 |
| 1 July 2019 | UDN | 1,087 | 26 | 35 | 22 |
| 1 July 2019 | You Media | 2,498 | 26.9 | 27.1 | 31.0 |
| 28 June 2019 | Trend poll | 1,068 | 20.4 | 33.4 | 31.9 |
| 28 June 2019 | Formosa | 1,071 | 18.8 | 28.5 | 35.7 |
| 25 Jun 2019 | Apple Daily | 1,076 | 22.9 | 33.7 | 26.7 |
| 24 Jun 2019 | TPOF | 1,092 | 27.5 | 29.4 | 36.9 |
| 24 Jun 2019 | TVBS | 1,674 | 20.0 | 29.0 | 37.0 |
| 22 June 2019 | Trend poll | 1,109 | 25.5 | 29.8 | 33.9 |
| 21 June 2019 | ETtoday | 5,051 | 19.5 | 31.9 | 36.6 |
| 20 Jun 2019 | China Times | 1,113 | 22.7 | 36.4 | 24.8 |
| 20 Jun 2019 | New Exhibition | 1,099 | 26.0 | 28.1 | 31.8 |
| 19 Jun 2019 | Green Party | – | 26.0 | 28.1 | 31.8 |
| 19 Jun 2019 | TISP | 1,093 | 22.9 | 31.4 | 28.0 |
| 18 Jun 2019 | ETtoday | 4,047 | 24.1 | 31.0 | 31.6 |
| 18 Jun 2019 | Apple Daily | 1,086 | 25.5 | 32.7 | 27.4 |
| 17 Jun 2019 | You Media | 1,081 | 29.9 | 27.1 | 27.8 |
| 15 Jun 2019 | Trend Poll | 1,086 | 23.7 | 26.2 | 38.3 |
| 13 Jun 2019 | Green Party Taiwan | 2,426 | 23.4 | 22.9 | 37.9 |
| 13 Jun 2019 | DPP primaries | 15,000 | 22.7 | 24.5 | 35.7 |
| 11 Jun 2019 | ETtoday | 5,957 | 25.3 | 31.4 | 29.7 |
| 11 Jun 2019 | Apple Daily | 1,761 | 27.6 | 30.4 | 30.0 |
| 8 Jun 2019 | Year poll | 1,166 | 24.6 | 27.9 | 31.3 |
| 8 Jun 2019 | New Exhibition | 1,070 | 24.7 | 28.0 | 30.6 |
| 6 Jun 2019 | CSPA | 1,068 | 26.9 | 33.3 | 27.0 |
| 6 Jun 2019 | Trend Poll | 1,081 | 25.7 | 32.1 | 30.9 |
| 5 Jun 2019 | Sanli News | 1,100 | 23.6 | 30.1 | 24.6 |
| 2 Jun 2019 | Apple Daily | 1,084 | 24.3 | 34.2 | 24.8 |
| 1 Jun 2019 | CCS | 1,823 | 25.7 | 29.5 | 25.5 |
| 28 May 2019 | Formosa | 1,086 | 29.3 | 27.9 | 26.9 |
| 19 May 2019 | Apple Daily | 1,080 | 25.2 | 33.7 | 25.6 |
| 16 May 2019 | Fount Media | 1,075 | 25.4 | 36.9 | 26.7 |
| 15 May 2019 | United Daily | 1,103 | 32.0 | 31.0 | 22.0 |
| 13 May 2019 | EtToday | 2,875 | 23.5 | 38.5 | 23.8 |
| 11 May 2019 | Apple Daily | 1,077 | 22.7 | 34.3 | 28.3 |
| 8 May 2019 | TVBS | 951 | 26.0 | 39.0 | 25.0 |
| 30 April 2019 | China Times | 1,004 | 25.0 | 41.1 | 20.9 |
| 29 April 2019 | TVBS | 1,090 | 25.0 | 42.0 | 23.0 |
| 25 April 2019 | Formosa | 1,068 | 24.1 | 32.3 | 24.5 |
| 25 April 2019 | TVBS | 1,222 | 25.0 | 42.0 | 22.0 |
| 21 April 2019 | ETtoday | 7,868 | 23.0 | 38.9 | 27.8 |
| 21 April 2019 | UDN | 1,178 | 26.0 | 36.0 | 20.0 |
| 21 April 2019 | TPOF | 1,072 | 27.9 | 35.8 | 27.5 |
| 17 April 2019 | Formosa | 1,078 | 22.9 | 37.8 | 24.8 |
| 2 April 2019 | Fount Media | 1,079 | 30.1 | 37.4 | 22.3 |
| 26 March 2019 | Formosa | 1,072 | 27.8 | 35.4 | 22.6 |
| 5 March 2019 | China Times | 2,026 | 22.9 | 31.9 | 15.6 |
| 5 March 2019 | Fount Media | 1,077 | 28.3 | 42.1 | 20.3 |
| 20 February 2019 | TVBS | 1,382 | 35.0 | 37.0 | 16.0 |
| 18 February 2019 | EtToday | 1,072 | 30.6 | 38.0 | 19.7 |
| 16 February 2019 | Apple Daily | 1,087 | 28.6 | 35.1 | 22.0 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 38.2 | 31.0 | 19.2 |
Gou–Tsai
| Date | Pollster | Sample size | Terry Gou KMT/Ind. | Tsai Ing-wen DPP |
| 1 July 2019 | Apple Daily | 1,093 | 43.8 | 26.1 |
| 1 July 2019 | UDN | 1,087 | 45 | 30 |
| 25 Jun 2019 | Apple Daily | 1,076 | 33.8 | 36.9 |
| 24 Jun 2019 | TVBS | 1,674 | 35.0 | 45.0 |
| 19 Jun 2019 | Green Party | – | 33.6 | 38.2 |
| 1 Jun 2019 | CCS | 1,823 | 40.1 | 37.0 |
| 28 May 2019 | Formsa | 1,086 | 37.3 | 37.7 |
| 19 May 2019 | Apple Daily | 1,080 | 40.7 | 33.5 |
| 16 May 2019 | Fount Media | 1,075 | 48.8 | 34.4 |
| 15 May 2019 | United Daily | 1,103 | 46.0 | 33.0 |
| 13 May 2019 | EtToday | 2,875 | 42.9 | 31.7 |
| 11 May 2019 | Apple Daily | 1,077 | 37.4 | 37.4 |
| 8 May 2019 | TVBS | 951 | 43.0 | 36.0 |
| 30 April 2019 | China Times | 1,004 | 45.6 | 30.3 |
| 29 April 2019 | TVBS | 1,090 | 44.0 | 35.0 |
| 25 April 2019 | Formosa | 1,068 | 37.1 | 35.9 |
| 25 April 2019 | TVBS | 1,222 | 44.0 | 33.0 |
| 17 April 2019 | Formosa | 1,078 | 48.2 | 32.1 |
| 17 April 2019 | IPO | 1,068 | 50.2 | 27.1 |
| 2 May 2017 | CTW | 825 | 35.7 | 24.2 |
Chu–Tsai
| Date | Pollster | Sample size | Eric Chu KMT | Tsai Ing-wen DPP |
| 1 Jun 2019 | CCS | 1,823 | 38.2 | 36.8 |
| 19 May 2019 | Apple Daily | 1,080 | 38.2 | 36.8 |
| 11 May 2019 | Apple Daily | 1,077 | 37.6 | 36.3 |
| 8 May 2019 | TVBS | 951 | 40.0 | 40.0 |
| 29 April 2019 | TVBS | 1,090 | 41.0 | 35.0 |
| 25 April 2019 | TVBS | 1,222 | 40.0 | 33.0 |
| 26 March 2019 | Formosa | 1,072 | 40.8 | 35.8 |
| 5 March 2019 | Fount Media | 1,077 | 50.0 | 34.9 |
| 22 February 2019 | TPOF | 1,089 | 46.5 | 37.9 |
| 20 February 2019 | TVBS | 1,382 | 46.0 | 27.0 |
| 16 February 2019 | Apple Daily | 1,087 | 50.2 | 33.6 |
| 27 December 2018 | UDN | 1,186 | 56.0 | 22.0 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 53.6 | 27.8 |
| 14 December 2018 | TVBS | 834 | 50.0 | 23.0 |
Wang–Tsai
| Date | Pollster | Sample size | Wang Jin-pyng KMT | Tsai Ing-wen DPP |
| 1 Jun 2019 | CCS | 1,823 | 23.5 | 39.7 |
| 27 May 2019 | Apple Daily | 1,081 | 25.2% | 38.2% |
| 19 May 2019 | Apple Daily | 1,080 | 25.5 | 37.4 |
| 11 May 2019 | Apple Daily | 1,077 | 26.9 | 38.3 |
| 8 May 2019 | TVBS | 951 | 27.0 | 39.0 |
| 29 April 2019 | TVBS | 1,090 | 27.0 | 35.0 |
| 25 April 2019 | TVBS | 1,222 | 28.0 | 34.0 |
| 5 March 2019 | Fount Media | 1,077 | 43.3 | 34.2 |
| 20 February 2019 | TVBS | 1,382 | 39.0 | 26.0 |
| 16 February 2019 | Apple Daily | 1,087 | 39.6 | 34.6 |
Ma–Tsai
| Date | Pollster | Sample size | Ma Ying-jeou KMT | Tsai Ing-wen DPP |
| 14 December 2018 | TVBS | 834 | 37.0 | 29.0 |
Chang–Tsai
| Date | Pollster | Sample size | Chang San-cheng Ind. | Tsai Ing-wen DPP |
| 14 December 2018 | TVBS | 834 | 34.0 | 27.0 |
Wu–Tsai
| Date | Pollster | Sample size | Wu Den-yih KMT | Tsai Ing-wen DPP |
| 20 February 2019 | TVBS | 1,382 | 27.0 | 32.0 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 29.4 | 41.4 |
| 14 December 2018 | TVBS | 834 | 26.0 | 34.0 |
Ko–Chu–Tsai
| Date | Pollster | Sample size | Ko Wen-je Ind. | Eric Chu KMT | Tsai Ing-wen DPP |
| 24 June 2019 | TPOF | 1,092 | 27.5 | 29.4 | 36.9 |
| 22 June 2019 | Trend poll | 1,109 | 26.9 | 21.0 | 32.9 |
| 14 June 2019 | Trend poll | 1,086 | 25.4 | 21.9 | 37.3 |
| 6 June 2019 | Trend poll | 1,081 | 31.4 | 23.5 | 31.2 |
| 1 Jun 2019 | CCS | 1,823 | 28.0 | 24.9 | 25.2 |
| 28 May 2019 | Trend poll | 1,145 | 29.6 | 30.0 | 31.9 |
| 22 May 2019 | Trend poll | 1,077 | 25.2 | 26.7 | 34.9 |
| 19 May 2019 | Apple Daily | 1,080 | 28.2 | 26.8 | 25.1 |
| 8 May 2019 | TVBS | 951 | 33.0 | 26.0 | 24.0 |
| 29 April 2019 | TVBS | 1,090 | 33.0 | 26.0 | 23.0 |
| 25 April 2019 | TVBS | 1,222 | 33.0 | 26.0 | 22.0 |
| 21 April 2019 | ETtoday | 7,868 | 28.8 | 24.7 | 27.8 |
| 21 April 2019 | UDN | 1,178 | 34.0 | 25.0 | 20.0 |
| 2 April 2019 | Fount Media | 1,079 | 35.9 | 30.1 | 22.7 |
| 26 March 2019 | Formosa | 1,072 | 32.4 | 24.6 | 23.2 |
| 5 March 2019 | China Times | 2,026 | 25.7 | 31.0 | 12.2 |
| 22 February 2019 | TPOF | 1,089 | 35.1 | 25.6 | 24.3 |
| 20 February 2019 | TVBS | 1,382 | 41.0 | 29.0 | 16.0 |
| 18 February 2019 | EtToday | 1,072 | 34.7 | 32.9 | 19.8 |
| 16 February 2019 | Apple Daily | 1,087 | 32.4 | 31.8 | 23.6 |
| 22 January 2019 | TVBS | 1,398 | 36.0 | 30.0 | 15.0 |
| 15 January 2019 | NCCU | 1,120 | 38.7 | 21.5 | 15.3 |
| 27 December 2018 | UDN | 1,186 | 45.0 | 30.0 | 11.0 |
| 24 December 2018 | Formosa | 1,074 | 33.3 | 27.2 | 22.8 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 34.3 | 29.5 | 28.2 |
Ko–Wang–Tsai
| Date | Pollster | Sample size | Ko Wen-je Ind. | Wang Jin-pyng KMT | Tsai Ing-wen DPP |
| 1 Jun 2019 | CCS | 1,823 | 34.7 | 13.2 | 25.8 |
| 19 May 2019 | Apple Daily | 1,080 | 32.9 | 14.3 | 26.4 |
| 8 May 2019 | TVBS | 951 | 38.0 | 15.0 | 23.0 |
| 29 April 2019 | TVBS | 1,090 | 38.0 | 14.0 | 22.0 |
| 25 April 2019 | TVBS | 1,222 | 37.0 | 15.0 | 22.0 |
| 21 April 2019 | ETtoday | 7,868 | 33.5 | 9.4 | 28.0 |
| 21 April 2019 | UDN | 1,178 | 39.0 | 13.0 | 19.0 |
| 20 February 2019 | TVBS | 1,382 | 41.0 | 23.0 | 17.0 |
| 16 February 2019 | Apple Daily | 1,087 | 40.1 | 20.5 | 21.6 |
| 22 January 2019 | TVBS | 1,398 | 38.0 | 22.0 | 15.0 |
Ko–Gou–Tsai
| Date | Pollster | Sample size | Ko Wen-je Ind. | Terry Gou KMT | Tsai Ing-wen DPP |
| 9 July 2019 | ETtoday | 2,271 | 15.1 | 34.8 | 31.7 |
| 9 July 2019 | Trend poll | 3,000 | 21.0 | 31.1 | 21.3 |
| 9 July 2019 | Apple Daily | 3,019 | 21.0 | 27.4 | 21.3 |
| 8 July 2019 | You Media | 2,501 | 19.8 | 29.2 | 26.0 |
| 8 July 2019 | Landscape poll | 1,079 | 20.9 | 31.4 | 24.9 |
| 5 July 2019 | Trend poll | 1,283 | 24.1 | 28.8 | 19.9 |
| 4 July 2019 | TIP | 1,071 | 18.1 | 30.9 | 23.3 |
| 2 July 2019 | Green Party | 1,433 | 25.0 | 27.3 | 32.4 |
| 2 July 2019 | Apple Daily | 1,093 | 21.4 | 32.5 | 20.1 |
| 1 July 2019 | UDN | 1,087 | 24 | 31 | 19 |
| 1 July 2019 | You Media | 2,498 | 18.7 | 28.4 | 29.7 |
| 28 June 2019 | Trend poll | 1,068 | 19.8 | 25.6 | 31.2 |
| 28 June 2019 | Formosa | 1,071 | 18.5 | 24.7 | 33.3 |
| 25 Jun 2019 | Apple Daily | 1,076 | 21.0 | 27.3 | 25.2 |
| 24 Jun 2019 | TVBS | 1,674 | 21.0 | 24.0 | 35.0 |
| 22 June 2019 | Trend poll | 1,109 | 24.5 | 20.7 | 32.4 |
| 21 June 2019 | ETtoday | 5,051 | 14.9 | 31.9 | 35.0 |
| 20 Jun 2019 | China Times | 1,113 | 21.5 | 29.2 | 24.3 |
| 20 Jun 2019 | New Exhibition | 1,099 | 25.8 | 23.1 | 30.6 |
| 19 Jun 2019 | Green Party | – | 25.8 | 23.1 | 30.6 |
| 19 Jun 2019 | TISP | 1,093 | 22.3 | 23.1 | 28.0 |
| 18 Jun 2019 | ETtoday | 4,047 | 18.2 | 35.2 | 30.5 |
| 18 Jun 2019 | Apple Daily | 1,086 | 25.8 | 27.8 | 25.4 |
| 11 Jun 2019 | ETtoday | 5,957 | 28.4 | 35.4 | 13.2 |
| 11 Jun 2019 | Apple Daily | 1,761 | 28.2 | 23.9 | 28.7 |
| 2 Jun 2019 | Apple Daily | 1,084 | 26.8 | 26.1 | 25.9 |
| 1 Jun 2019 | CCS | 1,823 | 25.4 | 28.4 | 26.1 |
| 28 May 2019 | Formsa | 1,086 | 30.4 | 23.8 | 26.4 |
| 19 May 2019 | Apple Daily | 1,080 | 25.0 | 30.2 | 23.7 |
| 16 May 2019 | Fount Media | 1,075 | 27.2 | 34.1 | 26.4 |
| 15 May 2019 | United Daily | 1,103 | 31.0 | 29.0 | 21.0 |
| 13 May 2019 | EtToday | 2,875 | 23.3 | 35.3 | 23.1 |
| 11 May 2019 | Apple Daily | 1,077 | 23.6 | 27.6 | 28.4 |
| 8 May 2019 | TVBS | 951 | 30.0 | 31.0 | 24.0 |
| 29 April 2019 | TVBS | 1,090 | 28.0 | 33.0 | 21.0 |
| 25 April 2019 | Formosa | 1,068 | 26.4 | 23.1 | 25.5 |
| 25 April 2019 | TVBS | 1,222 | 28.0 | 31.0 | 22.0 |
| 21 April 2019 | ETtoday | 7,868 | 22.7 | 35.8 | 27.1 |
| 21 April 2019 | UDN | 1,178 | 27.0 | 31.0 | 20.0 |
| 17 April 2019 | Formosa | 1,078 | 24.3 | 34.1 | 24.7 |
| 17 April 2019 | IPO | 1,068 | 25.2 | 35.6 | 20.2 |
| 2 April 2019 | Fount Media | 1,079 | 33.1 | 33.1 | 24.1 |
Tsai–Gou–Chu
| Date | Pollster | Sample size | Tsai Ing-wen DPP | Terry Gou Ind. | Eric Chu KMT |
| 17 May 2017 | Taiwan Style Foundation | 1,271 | 37.6 | 30.1 | 15.3 |
Ko–Wu–Tsai
| Date | Pollster | Sample size | Ko Wen-je Ind. | Wu Den-yih KMT | Tsai Ing-wen DPP |
| 20 February 2019 | TVBS | 1,382 | 44.0 | 16.0 | 20.0 |
| 22 January 2019 | TVBS | 1,398 | 45.0 | 13.0 | 17.0 |
| 27 December 2018 | UDN | 1,186 | 54.0 | 12.0 | 14.0 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 53.3 | 14.1 | 19.1 |
Ko–Wu–Lai
| Date | Pollster | Sample size | Ko Wen-je Ind. | Wu Den-yih KMT | William Lai DPP |
| 20 February 2019 | TVBS | 1,382 | 39.0 | 15.0 | 26.0 |
| 22 January 2019 | TVBS | 1,398 | 43.0 | 11.0 | 21.0 |
| 27 December 2018 | UDN | 1,186 | 50.0 | 11.0 | 23.0 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 43.5 | 11.9 | 34.4 |
Chu–Lai
| Date | Pollster | Sample size | Eric Chu KMT | William Lai DPP |
| 19 May 2019 | Apple Daily | 1,080 | 35.9 | 38.3 |
| 11 May 2019 | Apple Daily | 1,077 | 34.7 | 42.2 |
| 8 May 2019 | TVBS | 951 | 37.0 | 43.0 |
| 29 April 2019 | TVBS | 1,090 | 36.0 | 41.0 |
| 25 April 2019 | TVBS | 1,222 | 36.0 | 39.0 |
| 26 March 2019 | Formosa | 1,072 | 38.2 | 40.6 |
| 19 March 2019 | TPOF | 1,073 | 34.1 | 53.1 |
| 20 February 2019 | TVBS | 1,382 | 41.0 | 33.0 |
| 16 February 2019 | Apple Daily | 1,087 | 43.8 | 39.4 |
| 27 December 2018 | UDN | 1,186 | 47.0 | 32.0 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 43.8 | 41.0 |
| 14 December 2018 | TVBS | 834 | 40.0 | 39.0 |
Wang–Lai
| Date | Pollster | Sample size | Wang Jin-pyng KMT | William Lai DPP |
| 19 May 2019 | Apple Daily | 1,080 | 20.7 | 45.2 |
| 11 May 2019 | Apple Daily | 1,077 | 19.8 | 46.4 |
| 8 May 2019 | TVBS | 951 | 25.0 | 44.0 |
| 29 April 2019 | TVBS | 1,090 | 22.0 | 42.0 |
| 25 April 2019 | TVBS | 1,222 | 24.0 | 41.0 |
| 20 February 2019 | TVBS | 1,382 | 31.0 | 33.0 |
| 16 February 2019 | Apple Daily | 1,087 | 34.1 | 44.5 |
Han–Lai
| Date | Pollster | Sample size | Han Kuo-yu KMT | William Lai DPP |
| 28 May 2019 | Formsa | 1,086 | 36.3 | 40.8 |
| 19 May 2019 | Apple Daily | 1,080 | 40.3 | 40.3 |
| 16 May 2019 | Fount Media | 1,075 | 43.0 | 42.4 |
| 15 May 2019 | United Daily | 1,103 | 40.0 | 39.0 |
| 13 May 2019 | EtToday | 2,875 | 43.4 | 30.5 |
| 11 May 2019 | Apple Daily | 1,077 | 40.1 | 39.7 |
| 8 May 2019 | TVBS | 951 | 48.0 | 40.0 |
| 30 April 2019 | China Times | 1,004 | 47.2 | 32.9 |
| 29 April 2019 | TVBS | 1,090 | 50.0 | 37.0 |
| 25 April 2019 | Formosa | 1,068 | 40.8 | 39.3 |
| 25 April 2019 | TVBS | 1,222 | 50.0 | 36.0 |
| 21 April 2019 | TPOF | 1,072 | 41.7 | 46.2 |
| 17 April 2019 | Formosa | 1,078 | 46.4 | 37.5 |
| 26 March 2019 | Formosa | 1,072 | 45.5 | 39.8 |
| 19 March 2019 | TPOF | 1,073 | 41.5 | 48.7 |
| 20 February 2019 | TVBS | 1,382 | 49.0 | 32.0 |
| 16 February 2019 | Apple Daily | 1,087 | 49.4 | 36.9 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 43.5 | 41.6 |
Ma–Lai
| Date | Pollster | Sample size | Ma Ying-jeou KMT | William Lai DPP |
| 14 December 2018 | TVBS | 834 | 31.0 | 45.0 |
Chang–Lai
| Date | Pollster | Sample size | Chang San-cheng Ind. | William Lai DPP |
| 14 December 2018 | TVBS | 834 | 26.0 | 47.0 |
Gou–Lai
| Date | Pollster | Sample size | Terry Gou KMT | William Lai DPP |
| 28 May 2019 | Formsa | 1,086 | 34.8 | 39.4 |
| 19 May 2019 | Apple Daily | 1,080 | 36.4 | 37.6 |
| 16 May 2019 | Fount Media | 1,075 | 43.1 | 40.0 |
| 15 May 2019 | United Daily | 1,103 | 43.0 | 36.0 |
| 13 May 2019 | EtToday | 2,875 | 42.6 | 28.7 |
| 11 May 2019 | Apple Daily | 1,077 | 32.3 | 43.5 |
| 8 May 2019 | TVBS | 951 | 42.0 | 40.0 |
| 30 April 2019 | China Times | 1,004 | 43.0 | 33.1 |
| 29 April 2019 | TVBS | 1,090 | 42.0 | 38.0 |
| 25 April 2019 | Formosa | 1,068 | 34.7 | 39.6 |
| 25 April 2019 | TVBS | 1,222 | 42.0 | 37.0 |
| 17 April 2019 | Formosa | 1,078 | 44.6 | 38.6 |
| 17 April 2019 | IPO | 1,068 | 42.6 | 33.6 |
Wu–Lai
| Date | Pollster | Sample size | Wu Den-yih KMT | William Lai DPP |
| 20 February 2019 | TVBS | 1,382 | 22.0 | 41.0 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 19.9 | 60.3 |
| 14 December 2018 | TVBS | 834 | 18.0 | 53.0 |
Ko–Chu–Lai
| Date | Pollster | Sample size | Ko Wen-je Ind. | Eric Chu KMT | William Lai DPP |
| 19 May 2019 | Apple Daily | 1,080 | 28.0 | 26.0 | 27.1 |
| 8 May 2019 | TVBS | 951 | 33.0 | 27.0 | 25.0 |
| 29 April 2019 | TVBS | 1,090 | 33.0 | 25.0 | 24.0 |
| 25 April 2019 | TVBS | 1,222 | 32.0 | 26.0 | 23.0 |
| 21 April 2019 | ETtoday | 7,868 | 31.8 | 25.4 | 19.7 |
| 21 April 2019 | UDN | 1,178 | 34.0 | 23.0 | 23.0 |
| 2 April 2019 | Fount Media | 1,079 | 34.9 | 27.4 | 26.4 |
| 26 March 2019 | Formosa | 1,072 | 32.8 | 24.8 | 25.1 |
| 19 March 2019 | TPOF | 1,073 | 30.3 | 22.0 | 38.0 |
| 5 March 2019 | China Times | 2,026 | 24.8 | 27.5 | 13.8 |
| 22 February 2019 | TPOF | 1,089 | 34.1 | 23.7 | 30.4 |
| 20 February 2019 | TVBS | 1,382 | 39.0 | 27.0 | 19.0 |
| 16 February 2019 | Apple Daily | 1,087 | 31.2 | 30.0 | 25.8 |
| 22 January 2019 | TVBS | 1,398 | 33.0 | 29.0 | 21.0 |
| 27 December 2018 | UDN | 1,186 | 42.0 | 28.0 | 18.0 |
| 24 December 2018 | Formosa | 1,074 | 33.3 | 27.2 | 22.8 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 34.3 | 29.5 | 28.2 |
Ko–Wang–Lai
| Date | Pollster | Sample size | Ko Wen-je Ind. | Wang Jin-pyng KMT | William Lai DPP |
| 19 May 2019 | Apple Daily | 1,080 | 33.7 | 12.7 | 28.0 |
| 8 May 2019 | TVBS | 951 | 37.0 | 13.0 | 24.0 |
| 29 April 2019 | TVBS | 1,090 | 37.0 | 12.0 | 24.0 |
| 25 April 2019 | TVBS | 1,222 | 36.0 | 14.0 | 24.0 |
| 21 April 2019 | ETtoday | 7,868 | 37.1 | 9.4 | 19.5 |
| 21 April 2019 | UDN | 1,178 | 39.0 | 11.0 | 24.0 |
| 20 February 2019 | TVBS | 1,382 | 38.0 | 21.0 | 23.0 |
| 16 February 2019 | Apple Daily | 1,087 | 38.3 | 19.0 | 26.5 |
| 22 January 2019 | TVBS | 1,398 | 37.0 | 21.0 | 21.0 |
Ko–Han–Lai
| Date | Pollster | Sample size | Ko Wen-je Ind. | Han Kuo-yu KMT | William Lai DPP |
| 13 June 2019 | DPP primaries | 15,000 | 27.4 | 23.5 | 27.4 |
| 2 Jun 2019 | Apple Daily | 1,084 | 25.0 | 33.7 | 25.3 |
| 28 May 2019 | Formsa | 1,086 | 31.6 | 28.4 | 23.4 |
| 19 May 2019 | Apple Daily | 1,080 | 24.6 | 33.6 | 27.8 |
| 16 May 2019 | Fount Media | 1,075 | 25.4 | 36.3 | 25.4 |
| 15 May 2019 | United Daily | 1,103 | 33.0 | 31.0 | 23.0 |
| 13 May 2019 | EtToday | 2,875 | 26.9 | 38.6 | 18.6 |
| 11 May 2019 | Apple Daily | 1,077 | 24.8 | 32.2 | 26.6 |
| 8 May 2019 | TVBS | 951 | 27.0 | 39.0 | 24.0 |
| 30 April 2019 | China Times | 1,004 | 25.4 | 40.1 | 21.1 |
| 29 April 2019 | TVBS | 1,090 | 25.0 | 41.0 | 23.0 |
| 25 April 2019 | Formosa | 1,068 | 24.3 | 32.3 | 26.1 |
| 25 April 2019 | TVBS | 1,222 | 25.0 | 41.0 | 24.0 |
| 21 April 2019 | ETtoday | 7,868 | 26.9 | 39.3 | 18.2 |
| 21 April 2019 | UDN | 1,178 | 26.0 | 36.0 | 21.0 |
| 21 April 2019 | TPOF | 1,072 | 27.8 | 31.1 | 33.2 |
| 17 April 2019 | Formosa | 1,078 | 21.7 | 37.3 | 27.5 |
| 2 April 2019 | Fount Media | 1,079 | 27.6 | 35.4 | 27.5 |
| 26 March 2019 | Formosa | 1,072 | 28.3 | 32.1 | 26.8 |
| 19 March 2019 | TPOF | 1,073 | 26.0 | 29.9 | 36.5 |
| 5 March 2019 | China Times | 2,026 | 23.2 | 31.0 | 16.6 |
| 22 February 2019 | TPOF | 1,089 | 28.4 | 34.2 | 30.0 |
| 20 February 2019 | TVBS | 1,382 | 33.0 | 36.0 | 19.0 |
| 16 February 2019 | Apple Daily | 1,087 | 24.3 | 37.7 | 25.4 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 31.8 | 29.2 | 30.5 |
Ko–Gou–Lai
| Date | Pollster | Sample size | Ko Wen-je Ind. | Terry Gou KMT | William Lai DPP |
| 28 May 2019 | Formsa | 1,086 | 32.6 | 22.1 | 24.9 |
| 19 May 2019 | Apple Daily | 1,080 | 26.4 | 28.2 | 26.3 |
| 16 May 2019 | Fount Media | 1,075 | 26.4 | 34.4 | 27.4 |
| 15 May 2019 | United Daily | 1,103 | 31.0 | 28.0 | 23.0 |
| 13 May 2019 | EtToday | 2,875 | 26.3 | 35.2 | 18.1 |
| 11 May 2019 | Apple Daily | 1,077 | 26.6 | 23.7 | 29.4 |
| 8 May 2019 | TVBS | 951 | 30.0 | 31.0 | 24.0 |
| 29 April 2019 | TVBS | 1,090 | 28.0 | 31.0 | 24.0 |
| 25 April 2019 | Formosa | 1,068 | 28.2 | 23.0 | 26.2 |
| 25 April 2019 | TVBS | 1,222 | 27.0 | 30.0 | 24.0 |
| 21 April 2019 | ETtoday | 7,868 | 26.5 | 35.7 | 18.3 |
| 21 April 2019 | UDN | 1,178 | 28.0 | 30.0 | 22.0 |
| 17 April 2019 | Formosa | 1,078 | 23.4 | 32.2 | 28.1 |
| 17 April 2019 | IPO | 1,068 | 25.8 | 32.6 | 23.0 |
| 2 April 2019 | Fount Media | 1,079 | 31.5 | 31.5 | 28.6 |
Ko–Wu–Lai
| Date | Pollster | Sample size | Ko Wen-je Ind. | Wu Den-yih KMT | William Lai DPP |
| 20 February 2019 | TVBS | 1,382 | 39.0 | 15.0 | 26.0 |
| 22 January 2019 | TVBS | 1,398 | 43.0 | 11.0 | 21.0 |
| 27 December 2018 | UDN | 1,186 | 50.0 | 11.0 | 23.0 |
| 20 December 2018 | Taiwan Brain Trust | 1,072 | 43.5 | 11.9 | 34.4 |

## Legislative election
### Party vote

| Date | Source | DPP | KMT | PFP | NPP | NP | Green | SDP | TSU | MKT | NPSU | Trees | CUP | TPP | TSP | Other | Undecided | Lead |
| 31 Dec 2019 | Apple Daily | 32.0% | 19.6% | 4.3% | 6.7% | - | - | - | - | - | - | - | - | 10.2% | 3.9% | 3.8% | 19.5% | 2.4 |
| 30 Dec 2019 | Liberty Times | 23.0% | 15.7% | 1.8% | 5.9% | - | 1.6% | - | - | - | - | - | - | 7.5% | 3.6% | 6.2% | 35.5% | 6.3 |
| 30 Dec 2019 | Formosa | 32.6% | 18.7% | 1.5% | 2.9% | - | - | - | - | - | - | - | - | 3.4% | - | 9.5% | 30.7% | 4.9 |
| 30 Dec 2019 | ETtoday | 30.4% | 24.8% | 3.0% | 7.6% | 1.0% | 1.9% | - | - | - | - | - | - | 11.0% | - | 20.3% | - | 5.6 |
| 30 Dec 2019 | TPOF | 33.6% | 26.0% | 3.5% | 4.5% | - | - | - | - | - | - | - | - | 5.1% | - | 4.9% | 15.3% | 7.6 |
| 30 Dec 2019 | Green Party | 30.2% | 20% | 3.1% | 3.8% | - | 3.4% | - | - | - | - | - | - | 5.8% | 3.2% | - | 30.5% | 10.2 |
| 27 Dec 2019 | SGM | 31.7% | 23.3% | 4.3% | 6.1% | - | 1.7% | - | - | - | - | - | - | 9.1% | 3.5% | - | - | 8.4 |
| 26 Dec 2019 | Formosa | 32.4% | 22.5% | 3.5% | 7.2% | 1.0% | 3.1% | - | 0.6% | - | - | - | - | 9.6% | 3.4% | 1.8% | - | 9.9 |
| 26 Dec 2019 | Liberty Times | 34.02% | 15.79% | 1.40% | 6.17% | 0.47% | - | - | - | - | - | - | - | 7.38% | - | 6.17% | 30.37% | 8.23 |
| 19 Dec 2019 | TSP | 44.4% | 23.6% | 3.1% | 8.2% | - | 2.0% | - | - | - | - | - | - | 10.2% | 5.9% | 2.6% | - | 11.2 |
| 16 Dec 2019 | Apple Daily | 29.3% | 19.6% | 3.0% | 6.9% | - | - | - | - | - | - | - | - | 9.9% | - | 6.6% | 24.7% | 9.7 |
| 12 Dec 2019 | ETtoday | 28.8% | 27.7% | 2.6% | 6.9% | 0.7% | 1.4% | - | - | - | - | - | - | 12.6% | - | 19.2% | - | 1.1 |
| 7 Dec 2019 | UDN | 30% | 24% | 3% | 3% | - | - | - | - | - | - | - | - | 8% | - | 4% | 29% | 6 |
| 7 Dec 2019 | BrainTrust$^{10}$ | 30.6% | 18.9% | 3.7% | 7.0% | 0.6% | 2.4% | - | 0.2% | 0.5% | - | - | - | 11.5% | 0.7% | 1.0% | 22.7% | 11.7 |
| 4 Dec 2019 | Green Party | 31.9% | 22.0% | 2.9% | 7.0% | - | 1.0% | - | - | - | - | - | - | 11.5% | 2.0% | 1.0% | - | 9.9 |
| 4 Dec 2019 | TNC | 36.9% | 19.8% | 4.2% | 6.6% | - | - | - | - | - | - | - | - | 10.6% | - | 5.4% | 16.5% | 7.1 |
| 3 Dec 2019 | Fountmedia | 28.3% | 25.7% | 2.3% | 5.7% | - | 2.5% | - | - | - | - | - | - | 8.7% | 1.6% | 1.3% | 23.8% | 2.5 |
| 29 Nov 2019 | Formosa | 29.8% | 20.7% | 0.7% | 2.3% | - | - | - | - | - | - | - | - | 3.9% | - | 9.5% | 32.3% | 9.1 |
| 28 Nov 2019 | Liberty Times | 32.56% | 17.23% | 0.94% | 3.75% | 0.09% | - | - | - | - | - | - | - | 7.77% | - | 4.31% | 33.33% | 15.35 |
| 28 Nov 2019 | ETtoday | 32.3% | 27.9% | 4.7% | 4.8% | 1.3% | 1.3% | - | - | - | - | - | - | 10.4% | - | - | 17.2% | 4.4 |
| 27 Nov 2019 | Green Party | 33.9% | 27.9% | 4.3% | 6.5% | - | 2.2% | - | - | - | - | - | - | 9.8% | 1.8% | - | 13.8% | 6.0 |
| 26 Nov 2019 | UP Media$^9$ | 34.7% | 25.9% | 4.2% | 2.7% | 1.4% | 1.1% | - | 0.1% | 0.3% | - | - | - | 6.0% | 1.3% | 0.5% | 21.7% | 8.8 |
| 26 Nov 2019 | PinView | 23.6% | 22.9% | 2.8% | 3.7% | 0.9% | 1.4% | - | 0.2% | - | - | - | 0.1% | 7.6% | 1.4% | - | 26.5% | 0.7 |
| 25 Nov 2019 | WUFI | 31.8% | 35.6% | 5.4% | 5.9% | - | 1.6% | - | - | - | - | - | - | 13.9% | 3.8% | 2.2% | - | 3.8 |
| 23 Nov 2019 | Apple Daily | 31.2% | 24.2% | 3.5% | 5.0% | - | - | - | - | - | - | - | - | 10.1% | - | 26.0% | 26.0% | 7.0 |
| 25 Nov 2019 | ETtoday | 32.3% | 27.9% | 4.7% | 4.8% | 1.3% | 1.3% | - | - | - | - | - | - | 10.4% | - | 17.2% | 17.2% | 4.4 |
| 23 Nov 2019 | INA News | 38.25% | 32.06% | 4.78% | 4.72% | 1.57% | 2.08% | - | - | - | - | - | - | 12.50% | 2.92% | 1.01% | - | 4.15 |
| 20 Nov 2019 | Green Party | 28.4% | 28.2% | 3.6% | 4.1% | 1.2% | 1.6% | - | - | - | - | - | - | 11.1% | - | 1.3% | - | 0.2 |
| 19 Nov 2019 | PinView | 27.0% | 22.7% | 2.6% | 3.6% | - | - | - | - | - | - | - | - | 7.4% | - | - | - | 4.3 |
| 18 Nov 2019 | UDN | 29% | 29% | 4% | 3% | 1% | 1% | - | - | - | - | - | - | 8% | - | 1% | 25% | 0.0 |
| 18 Nov 2019 | Apple Daily | 26.5% | 25.2% | 2.9% | 7.5% | - | - | - | - | - | - | - | - | 10.1% | - | 2.1% | 25.7% | 1.3 |
| 15 Nov 2019 | TVBS | 23% | 33% | 4% | 7% | 0.6% | 0.5% | - | 0.2% | - | - | - | - | 12% | - | 1.2% | 20% | 10 |
| 14 Nov 2019 | WWCTMG | 22.0% | 25.2% | 2.3% | 5.9% | - | - | - | - | - | - | - | - | 7.5% | - | - | - | 3.2 |
| 14 Nov 2019 | PinView | 23.5% | 24.6% | 1.6% | 3.1% | - | - | - | - | - | - | - | - | 6.1% | - | - | - | 1.1 |
| 11 Nov 2019 | ETtoday | 31.7% | 33.2% | 3.2% | 8.0% | 1.2% | 1.4% | - | - | - | - | - | - | 14.3% | - | 7.0% | - | 1.5 |
| 7 Nov 2019 | TVBS | 25% | 37% | 2% | 7% | 0.9% | 0.3% | - | 0.8% | - | - | - | - | 10% | - | 1.1% | 16% | 12 |
| 5 Nov 2019 | WWCTMG | 24.2% | 29.7% | 1.2% | 4.5% | - | - | - | - | - | - | - | - | 4.7% | - | - | - | 5.5 |
| Oct 2019 | TPOF | 29.7% | 29.1% | - | 5.6% | - | - | - | - | - | - | - | - | 10.9% | - | 3.8% | 22.0% | 0.6 |
| 29 Oct 2019 | Formosa | 25.5% | 20.7% | 0.2% | 2.0% | - | - | - | - | - | - | - | - | 3.3% | - | 12.3% | 36.2% | 4.8 |
| 29 Oct 2019 | PinView | 23.8% | 25.4% | 1.1% | 3.6% | - | - | - | - | - | - | - | - | 4.9% | - | 37.2% | 37.2% | 1.6 |
| 27 Oct 2019 | ETtoday | 31.4% | 36.2% | 1.2% | 5.0% | 0.5% | 0.9% | - | - | - | - | - | - | 20.5% | - | 4.3% | - | 4.8 |
| 23 Oct 2019 | TVBS | 25% | 37% | 2% | 8% | 0.8% | 0.8% | - | 0.2% | - | - | - | - | 12% | - | 1.5% | 12% | 12 |
| 21 Oct 2019 | CNEWS$^8$ | 27.2% | 29.2% | 1.6% | 5.3% | 0.8% | 1.3% | - | 0.7% | 0.1% (CPA) | - | - | - | 9.6% | 0.7% | 1.5% | 22.1% | 2 |
| 17 Oct 2019 | PinView | 24.0% | 27.2% | 1.0% | 2.9% | - | - | - | - | - | - | - | - | 5.7% | - | 39.2% | 39.2% | 3.2 |
| 16 Sep 2019 | NCAP$^7$ | 25.3% | 28.6% | 1.9% | 6.4% | 0.3% | 0.8% | - | 0.1% | - | - | - | - | 8.2% | 1.2% | 0.5% | 26.6% | 9.5 |
| 8 Oct 2019 | Green Party | 31.6% | 38.3% | 0.9% | 6.5% | - | 2.0% | - | - | - | - | - | - | 8.3% | 1.0% | - | 11.5% | 6.7 |
| 1 Oct 2019 | Green Party | 25.1% | 34.5% | - | 2.2% | - | 1.8% | - | - | - | - | - | - | 12.1% | 1.2% | - | 27.1% | 9.4 |
| 1 Oct 2019 | Formosa | 28.9% | 24.2% | 0.3% | 1.6% | - | - | - | - | - | - | - | - | 2.1% | - | 11.7% | 31.4% | 4.7 |
| 29 Sep 2019 | ETtoday | 31.0% | 34.8% | 1.7% | 5.0% | 1.4% | - | - | 0.4% | - | - | - | - | 19.9% | - | 5.9% | - | 3.8 |
| 27 Sep 2019 | TVBS | 22% | 31% | - | 5% | - | - | - | - | - | - | - | - | 10% | - | 13% | 19% | 9 |
| 25 Sep 2019 | NCAP$^6$ | 23.3% | 32.8% | 1.9% | 6.9% | 0.4% | 1.8% | - | 0.2% | - | - | - | - | 8.0% | 1.4% | 0.3% | 22.9% | 9.5 |
| 24 Sep 2019 | Green Party | 27.1% | 37.5% | 0.7% | 6.9% | - | 1.9% | - | - | - | - | - | - | 9.4% | 1.4% | - | 15.0% | 10.4 |
| 17 Sep 2019 | Green Party | 25.1% | 33.1% | 1.7% | 8.4% | - | 2.1% | - | - | - | - | - | - | 8.9% | 3.1% | - | 14.9% | 8.0 |
| 10 Sep 2019 | ETtoday | 27.6% | 35.6% | 1.7% | 4.4% | 0.9% | - | - | 0.2% | - | - | - | - | 20.4% | - | 9.1% | - | 8.0 |
| 4 Sep 2019 | Green Party | 24.7% | 38.3% | 1.5% | 6.3% | - | 2.0% | - | - | - | - | - | - | 9.6% | 2.9% | - | 14.3% | 13.6 |
| Aug 2019 | TPOF | 30.2% | 29.6% | - | 6.7% | - | - | - | - | - | - | - | - | 8.1% | - | 6.5% | 17.8% | 0.6 |
| 30 Aug 2019 | TVBS | 22% | 27% | - | 6% | - | - | - | - | - | - | - | - | 6% | - | 7% | 31% | 5 |
| 30 Aug 2019 | Formosa | 28.9% | 24.4% | 0.1% | 1.7% | - | - | - | - | - | - | - | - | 5.4% | - | 11.5% | 28.1% | 4.5 |
| 29 Aug 2019 | ETtoday | 26.4% | 33.0% | 1.7% | 4.4% | 1.2% | - | - | 1.0% | - | - | - | - | 24.0% | - | 8.3% | - | 6.6 |
| 16 Aug 2019 | TVBS | 22% | 27% | - | 4% | - | - | - | - | - | - | - | - | 8% | - | 12% | 26% | 5 |
| 13 Aug 2019 | NCAP | 23.7% | 35.3% | - | 7.2% | - | - | - | - | - | - | - | - | 9.8% | 1.2% | 1.8% | 22.0% | 3.6 |
| 12 Aug 2019 | TVBS | 27.0% | 30.0% | - | 5.0% | - | - | - | - | - | - | - | - | 8.0% | - | 10.0% | 23.0% | 3 |
| 6 Aug 2019 | Green Party | 24.9% | 36.6% | 1.8% | 8.0% | - | 2.1% | - | - | - | - | - | - | 12.5% | 2.2% | 4.3% | 11.8% | 11.7 |
| 7 Aug 2019 | TCF | 30.5% | 27.2% | 2.3% | 4.7% | 0.7% | 1.0% | - | 1.3% (Formosa) | - | 1.1% | - | - | 15.5% | 0.7% | 2.9% | 12.7% | 3.3 |
| 30 Jul 2019 | Formosa | 26.5% | 23.4% | 0.2% | 4.2% | - | - | - | - | - | - | - | - | | - | 11.9% | 34.1% | 3.1 |
| 20 Jul 2019 | TVBS | 22% | 33% | - | 10% | - | - | - | - | - | - | - | - | | - | 7% | 27% | 11 |
| 4 Jul 2019 | Green Party | 31.7% | 34.8% | 2.9% | 13.5% | - | 1.5% | - | 0.7% | - | - | - | - | | - | 15.0% | 15.0% | 3.1 |
| 4 Jul 2019 | Trend Poll | 19.9% | 41.3% | - | 12.2% | - | - | - | - | - | - | - | - | | - | 11.9% | 14.7% | 21.4 |
| 28 Jun 2019 | Formosa | 27.0% | 23.7% | 0.1% | 3.6% | - | - | - | - | - | - | - | - | | - | 10.2% | 36.6% | 2.7 |
| 25 Jun 2019 | Trend Poll | 25.0% | 35.5% | - | 13.9% | - | - | - | - | - | - | - | - | | - | 9.0% | 16.6% | 10.5 |
| 22 June 2019 | TVBS | 25% | 28% | - | 11% | - | - | - | - | - | - | - | - | | - | 10% | 26% | 3 |
| 19 Jun 2019 | Green Party | 25.7% | 32.0% | 3.0% | 16.9% | - | 1.2% | - | 0.4% | - | - | - | - | | - | 3.3% | 17.4% | 6.3 |
| 18 Jun 2019 | Trend Poll | 28.3% | 31.3% | - | 11.9% | - | - | - | - | - | - | - | - | | - | 10.0% | 18.5% | 3.0 |
| 14 Jun 2019 | Trend Poll | 29.0% | 25.5% | - | 17.2% | - | - | - | - | - | - | - | - | | - | 12.5% | 15.8% | 3.5 |
| 9 Jun 2019 | Green Party | 29.0% | 32.5% | 1.8% | 14.4% | - | 1.3% | - | - | - | - | - | - | | - | 3.6% | 17.4% | 3.5 |
| 6 Jun 2019 | Trend Poll | 24.0% | 30.6% | - | 17.5% | - | - | - | - | - | - | - | - | | - | 10.1% | 17.8% | 6.6 |
| 28 May 2019 | Formosa | 25.6% | 25.4% | 0.3% | 4.1% | - | - | - | - | - | - | - | - | | - | 8.5% | 36.4% | 0.2 |
| 28 May 2019 | Trend Poll | 23.4% | 38.2% | - | 15.5% | - | - | - | - | - | - | - | - | | - | 8.9% | 14.0% | 15.2 |
| 22 May 2019 | Trend Poll | 27.3% | 29.8% | - | 18.0% | - | - | - | - | - | - | - | - | | - | 9.8% | 15.7% | 2.5 |
| 16 May 2019 | Fount Media | 26.8% | 35.3% | 1.4% | 9.2% | 1.1% | - | 0.7% | 0.4% | - | - | - | - | | 0.4% | 0.7% | 24.3% | 8.5 |
| 8 May 2019 | TVBS | 22% | 32% | - | 11% | - | - | - | - | - | - | - | - | | - | 8% | 27% | 10 |
| 29 Apr 2019 | Formosa | 24.4% | 25.5% | 0.3% | 3.5% | - | - | - | 0.0% | - | - | - | - | | - | 9.4% | 37.1% | 1.1 |
| 29 Apr 2019 | TVBS | 22% | 31% | - | 9% | - | - | - | - | - | - | - | - | | - | 8% | 31% | 9 |
| 2 Apr 2019 | Focus | 23.4% | 35.3% | 1.9% | 10.2% | 0.9% | 0.4% | 0.4% | 0.6% | - | - | - | 0.1% | | - | - | 27.0% | 11.9 |
| 1 Apr 2019 | Formosa | 21.4% | 26.0% | 0.2% | 3.1% | - | - | - | 0.1% | - | - | - | - | | - | 12.1% | 37.4% | 4.6 |
| 19 Mar 2019 | Taiwan Real Survey | 18.7% | 30.5% | 1.7% | 8.4% | 0.7% | 0.0% | - | 0.2% | 0.2% | - | - | - | | - | - | 39.5% | 11.8 |
| 5 Mar 2019 | Focus | 22.4% | 41.0% | 1.6% | 9.0% | 1.1% | 0.1% | - | 0.3% | - | - | - | - | | - | 0.1% | 24.5% | 18.6 |
| 25 Feb 2019 | Formosa | 20.4% | 24.8% | 0.5% | 3.5% | - | - | - | 0.2% | - | - | - | - | | - | 11.8% | 39.1% | 4.4 |
| 20 Feb 2019 | TVBS | 17% | 29% | - | 11% | - | - | - | - | - | - | - | - | | - | 12% | 32% | 12 |
| 16 Feb 2019 | Apple Daily | 25.6% | 31.9% | - | - | - | - | - | - | - | - | - | - | | - | 7.7% | 34.8% | 6.3 |
| 29 Jan 2019 | Formosa | 20.1% | 23.3% | 0.6% | 3.4% | - | - | - | 0.1% | - | - | - | - | | - | 11.2% | 41.5% | 3.2 |
| 25 Jan 2019 | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | The MKT merges into the Congress Party Alliance" | |
| 11 Jan 2019 | Taiwan Real Survey | 14.9% | 31.3% | 1.4% | 9.0% | 1.4% | 1.4% | - | 0.2% | 0.3% | - | - | - | | - | - | 40.1% | 16.4 |
| 7 Jan 2019 | ESC NCCU$^5$ | 18.1% | 30.4% | 0.6% | 2.7% | 0.3% | 0.5% | 0.2% | 0.1% | 0.2% | 0.1% | 0.0% | 0.2% | | 0.3% | 0.1% | 46.2% | 12.3 |
| 24 Dec 2018 | Formosa | 18.4% | 25.4% | 0.3% | 3.1% | - | - | - | 0.1% | - | - | - | - | | - | 11.0% | 40.1% | 7.0 |
| 23 Dec 2018 | ESC NCCU$^4$ | 17.7% | 28.4% | 0.7% | 4.3% | 0.3% | 0.2% | 0.1% | 0.0% | 0.2% | 0.0% | 0.2% | - | | 0.2% | 0.1% | 47.6% | 10.7 |
| 20 Dec 2018 | Taiwan Brain Trust | 20.5% | 30.0% | - | 17.0% | - | - | - | - | - | - | - | - | | - | 4.7% | 27.8% | 9.5 |
| 24 Nov 2018 | 2018 local elections$^b$ | 20.2% | 26.3% | 0.6% | 1.6% | 0.4% | 0.3% | 0.2% | 0.4% | 0.2% | 0.5% | 0.1% | 0.0% | | 0.3% | 14.0% | 34.9% | 6.1 |
| 30 Sep 2018 | ESC NCCU$^3$ | 18.8% | 26.3% | 1.3% | 3.3% | 0.4% | 0.6% | 0.1% | 0.0% | 0.2% | 0.4% | 0.1% | 0.0% | | 0.1% | 0.2% | 48.4% | 7.4 |
| 14 Sep 2018 | Taiwan Real Survey | 19.2% | 30.8% | 1.7% | 5.3% | 0.9% | 1.0% | - | 0.5% | 0.3% | - | - | - | | - | - | 40.2% | 11.6 |
| 1 Sep 2018 | Taiwan Real Survey | 16.5% | 21.8% | 1.3% | 4.7% | 0.6% | 1.1% | - | 1.1% | 0.7% | - | - | - | | - | - | 52.2% | 5.3 |
| 13 Aug 2018 | Taiwan Real Survey | 16.4% | 21.3% | 2.4% | 6.8% | 0.8% | 1.2% | - | 0.7% | 0.1% | - | - | - | | - | - | 50.4% | 4.9 |
| 24 Jul 2018 | Taiwan Real Survey | 14.6% | 23.1% | 2.9% | 6.0% | 0.5% | 0.8% | - | 0.3% | 0.1% | - | - | - | | - | - | 51.7% | 8.5 |
| 31 Jun 2018 | Taiwan Brain Trust | 23.2% | 30.2% | - | 13.5% | - | - | - | - | - | - | - | - | | - | 5.9% | 27.2% | 7 |
| 12 Jun 2018 | ESC NCCU | 19.7% | 26.7% | 0.7% | 7.1% | 0.5% | 0.6% | 0.3% | 0.0% | 0.2% | 0.2% | 0.1% | - | | - | - | 44.0% | 7.0 |
| 19 Apr 2018 | Taiwan Brain Trust | 30.7% | 21.7% | - | 12.2% | - | - | - | - | - | - | - | - | | - | 8.7% | 26.7% | 9 |
| 26 Mar 2018 | ESC NCCU$^1$ | 21.9% | 24.7% | 1.7% | 4.8% | 0.4% | 0.4% | 0.2% | 0.1% | 0.1% | 0.0% | 0.0% | - | | - | 0.2% | 45.6% | 2.7 |
| 30 Jan 2018 | Taiwan Real Survey | 18.1% | 19.1% | 2.1% | 6.2% | 0.9% | 0.7% | - | 0.0% | 0.1% | - | - | - | | - | - | 52.8% | 1.0 |
| 11 Jan 2018 | Taiwan Brain Trust | 30.4% | 25.6% | - | 8.8% | - | - | - | - | - | - | - | - | | - | 8.5% | 26.7% | 4.8 |
| 19 Dec 2017 | ESC NCCU | 22.4% | 25.6% | 1.3% | 5.9% | 0.4% | 0.7% | 0.2% | 0.1% | 0.0% | 0.1% | 0.2% | 0.1% | | - | - | 43.1% | 3.2 |
| 15 Sep 2017 | Taiwan Brain Trust | 33.6% | 23.9% | - | 12.3% | - | - | - | - | - | - | - | - | | - | 8.6% | 21.6% | 9.7 |
| 21 Apr 2017 | Taiwan Brain Trust | 28.2% | 21.5% | - | 11.1% | - | - | - | - | - | - | - | - | | - | 9.7% | 29.5% | 6.7 |
| 28 Oct 2016 | Taiwan Brain Trust | 26.7% | 17.4% | - | 15.4% | - | - | - | - | - | - | - | - | | - | 14.3% | 26.2% | 9.3 |
| 21 Apr 2016 | Taiwan Brain Trust | 35.1% | 17.2% | - | 10.5% | - | - | - | - | - | - | - | - | | - | 11.9% | 25.3% | 7.9 |
| 16 Jan 2016 | 2016 election$^a$ | 28.6% | 17.5% | 4.2% | 4.0% | 2.7% | 1.6% | 1.6% | 1.6% | 1.0% | 0.4% | 0.4% | 0.3% | | - | 2.9% | 35.1% | 11.1 |

### Coalition vote

| Date | Source | Green | Blue | Undecided | Lead |
| 30 Dec 2019 | Formosa | 41.0% | 25.0% | 30.7% | 16.0 |
| 7 Dec 2019 | BrainTrust | 41.6% | 23.7% | 22.7% | 17.9 |
| 29 Nov 2019 | Formosa | 37.9% | 26.0% | 32.3% | 11.9 |
| 29 Oct 2019 | Formosa | 33.4% | 27.2% | 36.2% | 6.2 |
| 21 Oct 2019 | CNEWS | 36.1% | 31.7% | 22.1% | 4.4 |
| 16 Sep 2019 | NCAP | 34.2% | 30.9% | 26-6% | 3.1 |
| 1 Oct 2019 | Formosa | 35.8% | 30.7% | 31.4% | 5.1 |
| 25 Sep 2019 | NCAP | 33.7% | 35.3% | 22.9% | 1.6 |
| 30 Aug 2019 | Formosa | 35.5% | 31.1% | 28.1% | 4.4 |
| 30 Jul 2019 | Formosa | 35.2% | 30.7% | 34.1% | 4.5 |
| 28 Jun 2019 | Formosa | 34.4% | 30.0% | 36.6% | 4.4 |
| 28 May 2019 | Formosa | 32.9% | 30.8% | 36.4% | 2.1 |
| 16 May 2019 | Fount Media | 37.7% | 37.9% | 24.3% | 0.2 |
| 29 Apr 2019 | Formosa | 31.0% | 32.1% | 37.1% | 1.1 |
| 2 Apr 2019 | Focus | 35.1% | 38.3% | 27.0% | 3.2 |
| 1 Apr 2019 | Formosa | 28.6% | 34.0% | 37.4% | 5.4 |
| 19 Mar 2019 | Taiwan Real Survey | 27.3% | 33.1% | 39.5% | 5.8 |
| 5 Mar 2019 | Focus | 31.8% | 44.0% | 24.5% | 12.3 |
| 25 Feb 2019 | Formosa | 28.7% | 32.4% | 39.1% | 3.7 |
| 16 Feb 2019 | Apple Daily | 32.2% | 33.0% | 34.8% | 0.8 |
| 29 Jan 2019 | Formosa | 28.1% | 30.5% | 41.5% | 2.4 |
| 11 Jan 2019 | Taiwan Real Survey | 25.6% | 34.3% | 40.1% | 8.7 |
| 7 Jan 2019 | ESC NCCU | 21.9% | 31.8% | 46.2% | 9.9 |
| 24 Dec 2018 | Formosa | 26.0% | 32.0% | 40.1% | 6.0 |
| 23 Dec 2018 | ESC NCCU | 22.6% | 29.6% | 47.6% | 7 |
| 24 Nov 2018 | 2018 local elections | 23.1% | 27.9% | 34.9% | 6.8 |
| 30 Sep 2018 | ESC NCCU | 22.9% | 28.7% | 48.4% | 5.8 |
| 14 Sep 2018 | Taiwan Real Survey | 26.0% | 33.7% | 40.2% | 7.7 |
| 1 Sep 2018 | Taiwan Real Survey | 23.4% | 33.9% | 52.2% | 10.5 |
| 13 Aug 2018 | Taiwan Real Survey | 25.1% | 24.6% | 50.4% | 0.5 |
| 24 Jul 2018 | Taiwan Real Survey | 21.7% | 26.6% | 51.7% | 5.9 |
| 12 Jun 2018 | ESC NCCU | 27.7% | 28.3% | 44.0% | 0.6 |
| 26 Mar 2018 | ESC NCCU | 27.4% | 26.9% | 45.6% | 0.5 |
| 30 Jan 2018 | Taiwan Real Survey | 25.0% | 22.2% | 52.8% | 2.8 |
| 19 Dec 2017 | ESC NCCU | 29.3% | 27.7% | 43.1% | 1.6 |
| 16 Jan 2016 | 2016 election | 36.3% | 26.2% | 35.1% | 11.1 |
| Notice: Green: Sum of DPP, NPP, Green, SDP, TSU, FTP, TAIP, TCA, PDP, Taiwan Radical Wings, TAPA and Formosa Alliance. Blue: Sum of KMT, PFP, NP, MKT/CPA, NPSU, CUP, YCP, Chinese National Zhi Gong Dang Party and Chinese National Progressive Party. ||||||

### Constituency vote
#### Taipei 4

| Polling Organization | Dates 2019 | Sample Size | KMT Li Yen-hsiu | DPP Kao Chia-yu |
| Storm Media | 11-13－11-15 | 1,069 | 43.4% | 39.9% |

#### Hsinchu City

| Polling Organization | Dates 2019 | Sample Size | KMT Cheng Zheng-chien | DPP Cheng Hung-huei | New Power Party Kao Yu-ting | Congress Party Alliance Liao Pei-ying |
| Cheng Hung-huei Campaign Office | 11-14－11-16 | 1,070 | 29.0% | 27.1% | 18.4% | 0.8% |