With the popularity of free trade agreements,and fast economic China,the economic development in the Asian region has been integrafed rapidly. Taiwanese government has signed the strait economic and trade cooperation agreements with China to ensure the competiveness of Taiwanese industry internationally. In this study, we apply the event study method,with the strait economic issues press day as the event day,to explore whether such information disclosure would be related to excess return in the stock market and how would the disclosure affect stock price. The empirical results in this study,indicate that the announcemt of opening of Chinese tourist、MOU-news issue and MOU-signed complete are both positively related to abnormal return. However,the announcemt of chartered flight between Taiwan and China、MOU- Taiwan banking to China and ECFA does not yield positive abnormal return.