This article analyzes the impact of the East Asian economic integration regime on Taiwan’s attractiveness of international investment. According to the questionnaire surveys conducted by this study, if Taiwan cannot participate in an East Asian economic integration agreement, 26-35% of Taiwan’s local and foreign enterprises will reduce their investment in Taiwan. If Taiwan participates in an East Asian economic integration agreement, 23- 37% of Taiwan’s local and foreign enterprises will increase their investment in Taiwan. Under the scenario of Taiwan’s participation in an East Asian economic integration agreement, compared to the scenario of Taiwan’s exclusion in an East Asian economic integration agreement, 49-72% of Taiwan’s local and foreign enterprises will increase their investment in Taiwan. If Taiwan and China sign an economic integration agreement, 30- 41% of Taiwan’s local and foreign enterprises will increase their investment in Taiwan. Furthermore, the consensus of Taiwan’s local and foreign enterprises is very significant and strong, indicating that the first priority partners for Taiwan to sign an East Asian economic integration agreement are China and the United States and the contents of an East Asian economic integration agreement should be a comprehensive and multi-functional economic integration agreement.