This paper investigates on nine listed Companies in Shanghai and Shenzhen stock markets that have implemented the Open Market Repurchase (OMR) program. In this research, the event study method is employed to analyze the effect of the OMR on the Companies’ value. At last the paper finds the rule of effect of OMR on listed company’s value, and indicates that the effect needs a long-term process of gradual release. Key words capital market, share repurchase, oen market repurchase, vlue of company