Abstract: The long-term return ratio of initial public offerings(IPO) is one of the hot spots in the IPO fields.Empirical examination of IPO long-term weak trend in Stock market has been carried out,while the stock market in our country has been established later and is still not mature.The information disclosure is not perfect,so it has the different characteristic,comparing with the stock market of developed countries.On the foundation of overseas scholars related the research technique and theoretical analysis,th...