Social security has played an important role in demographic structure. This paper found micro-to-macro benchmark about social security level and demographic structure, empirical analysis based on the data of China and ASEAN countries from 1995 to 2013 by GMM model. Empirical conclusions have shown that social security replacement rates are raised because social security level was increasing in China and ASEAN countries in recent years. Social security replacement rates depress total fertility rate and family married status by the change of social security rate, and can't be fully neutralized by counteracting inter-temporal or intergenerational transfers. Policy suggestions based on the analysis are proposed.