From the perspective of supply-demand equilibrium theory，the paper analyses the fitness degree between supply and demand of social endowment insurance systems for land-expropriated peasants based on social survey in 7 provinces in China. It finds that the system arrangement has low fitness degree with land-expropriated peasants’ demand in three dimensions. Firstly，the personal payment burden for land-expropriated peasants sounds heavier and the responsibility-share mechanism of money-raising is not rational enough. Secondly，the rule of payment in full can’t match land-expropriated peasants’ expectation for payment by installments. Finally，the pension treatment level is not high enough to satisfy the multi-level demands of land-expropriated peasants. In order to promote supply-demand equilibrium of social endowment insurance system for land-expropriated peasants，it is necessary to broaden the money-raising channels for endowment insurance and confirm each responsibilities，to reform the money-raising mechanism and enhance the pension standard so as to fully match the multi-level demands of land-expropriated peasants，to enhance land-expropriated peasants’ income so as to strengthen their payment abilities，and to promote land-expropriated peasants’ rationality level of old-age nursing concept so as to improve their recognition level on social endowment insurance systems.