Study On The Behavior Of Investors In China's Securities Market Man

China's securities market that start later is an emerging and started latter market, compared to the securities markets of developed countries, it is not an efficient market. China's individual investors is the main force of the securities market, Behavior finance theory is a good way to explain psychological weakness and the behavior deviation of securities investors. Behavior finance theory based on traditional finance can explain a lot of investment behavior of securities investors. So the theory can also be used to analyze China's securities market, to provide advice improving investment deviation for investors, and contribute to regulators and stable China securities market.This paper introduces the origin and development of behavioral finance which can explain cognitive biases and behavior deviations of securities investors, and made the actual questionnaire survey on some deviations in order to analysis investment behavior by behavior deviations. The most important of all, the paper discusses all sorts of securities investors' wrong operation from the actual operation of investors. At last, this paper provides some advice for investors to overcome the cognitive biases and psychological deviation, therefore suggests the government regulators to formulate relevant laws and regulations and to guide the investors.