How to maintain and increase the value of social security fund is directly related to the basic life of each person .With the increasing amount of social security funds, how to better operate the funds also become more and more concerned issue of society. By Eviews software, Chinese deposits, stocks, bonds, funds, corporate bond returns and risks of 2007 to 2014 were analyzed and compared to design a series of investment combination model.Clarified the relationship between return and risk, and advanced some suggestions on how to improve the benefits of social security fund.