Exhibit 8.1

List of Significant Subsidiaries of United Microelectronics Corporation



|                                                                          |  |                              |  |                                                |        |  
|------------------------------------------------------------------------- |  | ---------------------------- |  | ---------------------------------------------- | ------ | -
|Company                                                                   |  | Jurisdiction ofIncorporation |  | Percentage of Ownershipas of December 31, 2011 |       
|UMC Group (USA)                                                           |  | California, U.S.A.           |  |                                                | 100.00 | %
|United Microelectronics (Europe) B.V.                                     |  | The Netherlands              |  |                                                | 100.00 | %
|UMC Capital Corp.                                                         |  | Cayman Islands               |  |                                                | 100.00 | %
|TLC Capital Co., Ltd.                                                     |  | Taiwan, R.O.C.               |  |                                                | 100.00 | %
|UMC New Business Investment Corp.                                         |  | Taiwan, R.O.C.               |  |                                                | 100.00 | %
|Green Earth Limited                                                       |  | Samoa                        |  |                                                | 100.00 | %
|Fortune Venture Capital Corp.                                             |  | Taiwan, R.O.C.               |  |                                                | 100.00 | %
|UMC Japan                                                                 |  | Japan                        |  |                                                | 100.00 | %
|UMC Investment (Samoa) Limited                                            |  | Samoa                        |  |                                                | 100.00 | %
|Unitruth Investment Corp.                                                 |  | Taiwan, R.O.C.               |  |                                                | 100.00 | %
|UMC Capital (U.S.A)                                                       |  | California, U.S.A.           |  |                                                | 100.00 | %
|ECP VITA Ltd.                                                             |  | British Virgin Islands       |  |                                                | 100.00 | %
|Soaring Capital Corp.                                                     |  | Samoa                        |  |                                                | 100.00 | %
|Unitruth Advisor (Shanghai) Co., Ltd.                                     |  | China                        |  |                                                | 100.00 | %
|Tera Energy Development Co., Ltd.                                         |  | Taiwan, R.O.C.               |  |                                                | 100.00 | %
|Green Field (Samoa) Limited                                               |  | Samoa                        |  |                                                | 100.00 | %
|New Business Realty (Samoa) Limited                                       |  | Samoa                        |  |                                                | 100.00 | %
|Nexpower Technology Corp.                                                 |  | Taiwan, R.O.C.               |  |                                                | 57.33  | %
|Wavetek Microelectronics Corporation                                      |  | Taiwan, R.O.C.               |  |                                                | 72.16  | %
|United Lighting Opto-Electronic Inc.                                      |  | Taiwan, R.O.C.               |  |                                                | 55.25  | %
|United Lighting Opto-Electronic Investment (HK) Limited                   |  | China                        |  |                                                | 55.25  | %
|Power Light Investments Limited                                           |  | Samoa                        |  |                                                | 55.25  | %
|Bao Lin (Shandong) Guang Dian Ke Ji You Xian Gongsi                       |  | China                        |  |                                                | 55.25  | %
|Everrich Energy Corp.                                                     |  | Taiwan, R.O.C.               |  |                                                | 90.61  | %
|Everrich Energy Investment (HK) Limited                                   |  | China                        |  |                                                | 90.61  | %
|Everrich (Shandong) Energy Co. (formerly Yongsheng (Shandong) Energy Co.) |  | China                        |  |                                                | 90.61  | %
|Unistars Corp.                                                            |  | Taiwan, R.O.C.               |  |                                                | 72.83  | %
|Topcell Solar International Co. Ltd.                                      |  | Taiwan, R.O.C.               |  |                                                | 70.09  | %
|Smart Energy Enterprises Limited                                          |  | China                        |  |                                                | 90.61  | %
|Smart Energy ShanDong Corporation                                         |  | China                        |  |                                                | 90.61  | %
|Wavetek Microelectronics Investment (HK) Limited                          |  | China                        |  |                                                | 72.16  | %
|Newenergy Holding Limited                                                 |  | Samoa                        |  |                                                | 57.33  | %
|Futurepower Holding Limited                                               |  | Samoa                        |  |                                                | 57.33  | %
|Nexpower (Shandong) Energy Co., Ltd                                       |  | China                        |  |                                                | 57.33  | %
|NPT Holding Limited                                                       |  | Samoa                        |  |                                                | 57.33  | %
|NLL Holding Limited                                                       |  | Samoa                        |  |                                                | 57.33  | %