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The evaluation and quantization on the service quality is a difficult problem for its research. Hazing discussed service quality evaluation models and methods, the paper constructs a new evaluation method of the service quality based on gray-fuzzy theory. Learning from the advantages of SERVQUAL and SERVPERF, the method designs evaluation indicators. By combining the weighting with the gray fuzzy mathematical model, the service quality is quantificational evaluated. The method allows the qualitative evaluation and quantitative evaluation can be a good combination.