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Aiming at the problem that the current evaluation model of information system performance efficiency is simple, and the evaluation results are random and fuzzy, an evaluation method of information system performance efficiency is designed. Analyze and draw the information system performance efficiency execution framework diagram, build evaluation indicators, apply the improved efficiency coefficient method to normalize the evaluation indicator scores from a multi-level perspective, and build a multi weight combination weighting method that combines the subjective weight and objective weight of multiple experts based on the contrast and conflict between weights, which not only overcomes the subjective bias of a single expert, but also comprehensively considers the advantages of subjective and objective weights, The cloud model combined with the combination of weighting weights is used to describe the comprehensive evaluation results of performance efficiency in natural language to overcome the fuzziness and randomness of the comprehensive evaluation; Finally, the method is applied to a large CRM information system, and the results show that the comprehensive evaluation grade of the CRM system is moderate, which basically meets the requirements of performance efficiency. The results are consistent with the plan review results, which verify the effectiveness and applicability of the method in performance efficiency evaluation.