| Regulatory authorities set capital requirements to cover the position risk of securities firms. This article attempts to test the adequacy of current calculation rules of capital for securities firms in China, and to compare the efficiency of Comprehensive Approach and Simplified Portfolio Approach in securities markets of China on the basis of VAR model, and then to find out the most optimal method to calculate the capital for securities firms in China.The thesis begins with theoretic analysis followed by empirical researches, accompanied by comparative study of domestic situation and management system overseas. After a fully case study, countermeasures are given to solve the problems.As in the structure, chapter three and four form the principal part of the thesis, with the previous two chapters as theoretical basis and chapter five as a conclusion which makes the thesis a holistic unity. |