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The growth in medical expenses leads a lot of pressure to the sustainable development of the health insurance industry in China.Firstly,Chinas per capita medical expenses are expressed as triangular fuzzy numbers; then fitting parameters with fuzzy least square method.It provides a new way of thinking and methods to study and forecast medical expenses of per capita Medical costs in China.Conventional regression analysis gives the correlation coefficient confidence intervals,reflecting the estimated coefficient for the degree of certainty.Fuzzy regression relationship analyze two functions: one is function of the central value of observed data,the other is the functional of the spread of observed data,and we have on the results of per capita medial expenses.Fuzzy regression analysis is based on the close degree of two Fuzzy sets,it reflects the degree of certainty level between the observed data and the fitting data.