Research on adjusting the contribution rate of basic old-age insurance is one of the important reform decisions put forward by the Third Plenary Session of the 18th National Congress of the Communist Party of China.In this paper，we research and explore the feasibility of reducing the contribution rate of basic old-age insurance，and put forward the basic idea of adjusting the basic old-age insurance contribution rate and supporting measures.

This paperconcludes that old-age insurance takes on responsibility of cope with old age risks and plays a function of protecting basic life，so it is necessary to maintain a certain contribution rate and the contribution rate can't be too low.At the same time，we should take into account the level of economic development，enterprise development and the affordability of all parties，so the rate can't be too high.We think the adjustment of the contribution rate should achieve three goals of the moderate contribution level，the appropriate secure level and the balance of the fund.Therefore，it is suggested that the government should properly reduce the contribution rate of basic old-age insurance on the basis of clear goal of secure level，and gradually explore the dynamic adjustment mechanism which is related to contribution rate and pension level.Meanwhile，it is recommended to improve the relevant supporting measures which play a “combination boxing”in order to create institutional conditions and financial security for reducing the contribution rate.