Abstract: In the electricity market environment, electricity enterprises face the business risk caused by the credit problem of electricity customers. According to the characteristics of the variety of evaluating indices, the fuzzy synthetic evaluation method is presented to evaluate the credit of electricity customers in this paper, and to determine their credit ratings. Then the electricity enterprise can take suitable incentive and penalty strategy toward different credit ratings, and improve business benefit of electricity enterprise. Through analyzing on a set of customers data, the credit ratings of electricity customers are obtained, and they are compared with the real credit of electricity customers, which verifies the validity and rationality of the method. This method proposed in this paper has practical significance for electricity enterprises to increase the recovery of electricity charge, so as to avoid the business risk of enterprises.