Exhibit 8.1

List of Significant Subsidiaries of United Microelectronics Corporation



|                                                 |  |                              |  |                                                |        |  
|------------------------------------------------ |  | ---------------------------- |  | ---------------------------------------------- | ------ | -
|Company                                          |  | Jurisdiction ofIncorporation |  | Percentage of Ownershipas of December 31, 2012 |       
|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 PTE. LTD.                               |  | Singapore                    |  |                                                | 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 | %
|Nexpower Technology Corp.                        |  | Taiwan, R.O.C.               |  |                                                | 57.33  | %
|Wavetek Microelectronics Corporation             |  | Taiwan, R.O.C.               |  |                                                | 74.69  | %
|Everrich Energy Corp.                            |  | Taiwan, R.O.C.               |  |                                                | 89.38  | %
|Everrich Energy Investment (HK) Limited          |  | China                        |  |                                                | 89.38  | %
|Everrich (Shandong) Energy Co., Ltd.             |  | China                        |  |                                                | 89.38  | %
|Unistars Corp.                                   |  | Taiwan, R.O.C.               |  |                                                | 72.04  | %
|Topcell Solar International Co. Ltd.             |  | Taiwan, R.O.C.               |  |                                                | 69.91  | %
|Smart Energy Enterprises Limited                 |  | China                        |  |                                                | 89.38  | %
|Smart Energy ShanDong Corporation                |  | China                        |  |                                                | 89.38  | %
|Wavetek Microelectronics Investment (HK) Limited |  | China                        |  |                                                | 74.69  | %
|NPT Holding Limited                              |  | Samoa                        |  |                                                | 57.33  | %
|NLL Holding Limited                              |  | Samoa                        |  |                                                | 57.33  | %
|SOCIALNEX ITALIA 1 S.R.L.                        |  | Italy                        |  |                                                | 57.33  | %
|TERA ENERGY USA INC.                             |  | U.S.A.                       |  |                                                | 100.00 | %
|UMC (BEIJING) LIMITED                            |  | China                        |  |                                                | 100.00 | %