This paper based on Sen capability approach, using fuzzy mathematics and factor analysis method to measure Chinese provincial cities social welfare index between 2004 and 2013,analyzed the relationship between social welfare and land financeThe empirical results showed following conclusionsFirst, coastal cities social welfare index was relatively high, then the contributions to social welfare index of transparency guarantee, social opportunity, economic condition, protective safeguard and political freedom were increasingSecond, eastern coastal cities absolute and relative land finance were far more than western cities, then social welfare and land finance cannot match wellThird, social welfare had a positive spatial correlation, different provincial city social welfare index existed spatial agglomeration and diffusion phenomenaFinally, through dynamic spatial panel model to empirical analyze found that the relationship between land finance and social welfare index was inverted Ushaped curve.