Exhibit 8.1

List of Significant Subsidiaries of United Microelectronics Corporation

	Jurisdiction of	Percentage of Ownership as of
Company	Incorporation	December 31, 2008
UMC Group (USA)	California, USA		100.00%
United Microelectronics (Europe) B.V.	The Netherlands		100.00	%
UMC Capital Corp.	Cayman Islands		100.00%
United Microelectronics Corp. (Samoa)	Samoa		100.00%
TLC Capital Co., Ltd	Taiwan, ROC		100.00%
UMCi Ltd.	Singapore		100.00%
Fortune Venture Capital Corp.	Taiwan, ROC		99.99%
United Microdisplay Optronics Corp.	Taiwan, ROC		89.99%
UMC Japan	Japan		52.64%
Unitruth Investment Corp.	Taiwan, ROC		99.99%
UMC Capital (USA)	California, USA		100.00%
ECP VITA Ltd.	British Virgin Islands		100.00%
Soaring Capital Corp.	Samoa		100.00%
Unitruth advisor (Shanghai) Co., Ltd.	China		100.00%