In recent years many studies have been performed about stock repurchase programs regarding abnormal returns around event announcements. This paper will probe the factors for the decline of operating performance and corporate business achievement, the reasons managers decide to reduce capital by purchasing stock from the stock market to improve their finance structure, and then re-increase capital. Finally this paper will look at the relationships between abnormal returns and stock repurchase announcements. The study results show how investors can benefit from event announcements by reducing capital through stock repurchase and how changing current government policies can further enterprise integration which will create greater value for stockholders.