The performance of the green supply chain was evaluated with the conversion algorithm of membership to improve the shortage of green supply chain and improve performance leve.The author firstly founded a set of green supply chain performance evaluation index system,and mined the data hidden in the membership degree of each index with entropy according to the membership and weight of indicators already known,then introduced the effective value and the comparable value to achieve comparability,and finally finished the evaluation of the green supply chain from the second-grade indexes to the first-grade indexes,and the first-grade indexes to the overall goal.The performance of the green supply chain of an electronic company in Guangzhou was evaluated,and the results showed that the green supply chain performance level of the electronics company achieved the second-grade level "good",and the contribution of the supply chain management level and the information technology level to the overall performance was low and remained to be improved.