The Positve Analysis On The Security Portfolio Investment Theory

The security portfolio investment theory was promoted on the basis of western developed security market. How about the efficiency and applicability of the theory when it is applied to our new developing security market. At present, the question has become a topic of general interest in our investment field.Beginning with the basic concepts, the paper analyzes the assumption, the kernel part, the mutual relationship and difference of the three main investment theory. Moreover, I make the positive analysis with the actual date of our security market. By means of quadratic programming, I get the efficient convex and portfolio at the point of tangency. Through the aggression, I get the portfolio of SIM at the point of tangency. With the two-step regression, I preliminarily test the CAPM. According to the three-achievement index, I grade some funds of our country./ aThrough the theory research and positive analysis, the paper preliminarily put forward some approach to maximize the investment profit margin and minimize the investment risk and give some research results about the efficiency and applicability of the theory at our current security market.