Exhibit 8.1  JURISDICTION OF INCORPORATION NAME OF ENTITY CHIEF Telecom Inc. Taiwan, R.O.C. Chunghwa International Yellow Pages Co., Ltd. Taiwan, R.O.C. Chunghwa Investment Co., Ltd. Taiwan, R.O.C. Chunghwa Precision Test Tech. Co., Ltd Taiwan, R.O.C. Chunghwa System Integration Co., Ltd. Taiwan, R.O.C. InfoExplorer Co., Ltd. Taiwan, R.O.C. Light Era Development Co., Ltd. Taiwan, R.O.C. Senao International Co., Ltd. Taiwan, R.O.C. Spring House Entertainment Inc. Taiwan, R.O.C. Unigate Telecom Inc. Taiwan, R.O.C. Yao Yong Real Property Co., Ltd. Taiwan, R.O.C. New Prospect Investments Holdings Ltd. British Virgin Islands Prime Asia Investments Group Ltd. British Virgin Islands Chunghwa Investment Holding Company Brunei Concord Technology Co., Ltd. Brunei CHI One Investment Co., Ltd. Hong Kong Donghwa Telecom Co., Ltd. Hong Kong Senao International HK Limited Hong Kong InfoExplorer (Hong Kong) Co., Limited Hong Kong Chunghwa Hsingta Company Ltd. Hong Kong Chunghwa Telecom Japan Co., Ltd. Japan Chief International Corp. Samoa Islands Senao International (Samoa) Holding Ltd. Samoa Islands InfoExplorer International Co., Ltd. Samoa Islands Glory Network System Service (Shanghai) Co., Ltd. Shanghai, People’s Republic of China Chunghwa Telecom (China), Co., Ltd Shanghai, People’s Republic of China Chunghwa Telecom Singapore Pte., Ltd. Singapore Chunghwa Telecom Global, Inc. United States of America Chunghwa Precision Test Tech. USA Corporation United States of America 8 LIST OF SUBSIDIARIES  (as of March 31, 2011) 