Using to the network questionnaire investigation of WeChat purchasing providers, the indexes of economic performance evaluation and purchasing goods which WeChat purchasing Suppliers are more concerned are selected, and the input and output indexes and decision-making unit of DEA are determined. Using DEA method, the analysis of economic effectiveness is achieved, and the second performance evaluation of three WeChat purchasing suppliers are implemented and sorted by using TOPSIS method, and finally, the best WeChat purchasing provider is selected, and the performance evaluation of WeChat purchasing providers are realized by combining with DEA and TOPSIS methods.