In this paper,in view of the coexistence of various social pension insurance system at present in China,its financing standards and standards of treatment are quite different in various social pension insurance system,lower investment yields of pen-sion funds and other issues, from endowment insurance model,the source of pension funds and financing standards,investment su-pervision of pension funds and other aspects to design a national integrated social pension insurance system. Then calculated re-placement rates and the level of expenditure of social endowment insurance by create a measurement model based on the integra-tion design of social endowment insurance,through estimates and analysis of the integration social endowment insurance,this design scheme in line with China’s national conditions. This paper attempts to provide a foundation of theoretical support and empirical analysis for our government to formulate a unified national social pension insurance system,thus effectively address the negative impact on socio-economic development because of “old before getting rich” and the gradual aging of the population in China.%本文针对当前我国各种养老保险制度并存、不同养老保险制度其筹资标准和待遇标准差异较大及社会养老保险基金投资运营收益率较低等问题，从养老保险模式、养老保险的筹资渠道和筹资标准及养老保险基金投资监管等方面就建立全国一体化的社会养老保险进行了制度设计。然后根据社会养老保险一体化设计方案建立计量模型就我国社会养老保险的替代率和支出水平进行了测算。通过对社会养老保险设一体化计方案的测算和分析可知，该设计方案符合我国国情。本文试图为我国政府制定全国统一的社会养老保险制度提供理论支撑和实证分析的依据，进而有效地解决我国因“未富先老”及人口老龄化逐步加深而对社会经济发展造成的负面影响。
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