This study’s purpose is to do the event study of stock repurchase on the public traded companies from the year of 2006 to 2015 and observe the abnormal return. Furthermore, this study also does the empirical study of stock repurchase according to the two kinds of repurchase purposes (The purpose of protecting for the company reputation and shareholder’s equity and the purpose of transferring the stocks to employees), and compares each other. About the empirical results, first, there are all negative abnormal returns before the repurchase announcement. After announcement, the abnormal return is positive, and gradually declines. Second, the purpose of protecting the company reputation and shareholders has more effects on abnormal return than the purpose of transferring the stocks to the employees.