Abstract: The gradual stock of human capital is a final force to decide the level of a country's socio-economic development.And the social security system is in a position to maintain and raise the quality of human capital,to have income redistribution and other functions,playing an important role in promoting social development.The continued growth of investment in human capital is in a position to achieve long-term sustainable economic development,and constant improvement of the social security system can achieve political and social stability,and in return to promote investment in human capital as well as achieving the synergies of human capital investment and social security.That is the right way for us to obtain harmonious development.