Abstract: The choice of phase change materials need to consider phase change enthalpy, specific heat, thermal conductivity, density, degree of super-cooling and price and so comprehensively.In order to solve the problems of the conflict and different dimensional attribute, the index system of different levels and phase change material performance evaluation model are established based on VIKOR method.Determine the weight of the index system by the AHP method and sort all kinds of phase change materials based on the evaluation model for the comprehensive performance.Research showed that the evaluation model based on VIKOR method was in conformity with the actual research to indicate that the VIKOR method had strong theoretical and practical.

Key words: phase change materials;VIKOR method;evaluation index;choice