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Quantitatively evaluating the service quality of power supply is significant in electricity market, and it is beneficial to improve service quality. This paper proposed an applicable method to assess service quality with four grades based on fuzzy set theory. Considering the attributes and main factors that influence service quality, a two-level evaluation index system was set up. It is effective to determine the weights of each factor with Fuzzy Analytic Hierarchy Process (FAHP), which is easier than AHP in verifying the consistency of judgment matrix. At the same time, the paper carried out fuzzy evaluation of single factor and fuzzy comprehensive evaluation. Calculation results of actual example show that the proposed fuzzy comprehensive evaluation method is effective to distinguish service quality level.