This study examines if the financial structure of the firms get improved after capital reduced, and investigates any abnormal return in different types of capital reduction when the declaration. Therefore, the investers may analysing the financial data to discover which capital reduction mode that the firms determine to use, and employ the information to estimate the firms’ future business performance. The results show that the stock repurchase would not support positive effect in business, but the market will reflect positive abnormal return in capital reduction declaration. There is significant relation between book-to-market ratio, firm size, the deviation of the debt ratio, cash flow ratio with cumulative abnormal return. Finally, the firms prefer to adopt cash reduction when they have large firm size, low deviation of the debt ratio, high cash dividend and high insider holding ratio.