DOI: 10.36347/sjebm.2018.v05i05.005

Pages: 375-378

With the financial markets to expand unceasingly, more and more investors into the securities market, in pursuit of the interests of the free flow of capital will flow to the economic benefit is high, and the interests of investors in securities investment to pursue higher, need to consider the measure for solving the optimal combination of the risk, so that investors can obtain reasonable returns when get smaller risk. Considering the influence of various factors, a mean-variance portfolio model is established, and a reasonable rate of return is given, and the optimal investment portfolio with the lowest risk is calculated, and a reasonable conclusion is obtained through an example analysis.