Minimum rate of return guarantees for Social Security fund

Social Security fund has already entered capital market, however , the capital market which is an outlet for investment is full of risks. As the money for common people to retain life, how to face the risks and how to avoid loss of Social Security fund is an issue which needs to be solved urgently. Learning from foreign experience that annuity provides minimum rate of return guarantees, the problem that how to ensure fund security is discussed, namely, how to provide the minimum rate of return guarantees for the Social Security fund in our country.