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Aiming at the current satellite develop trend of complication, multitasking and clustering, the traditional performance exhaustive method and single performance evaluation method for satellite comprehensive effectiveness evaluation can not be satisfied. Researched on satellite comprehensive effectiveness index system and took micro-nano cluster satellite as an example, hierarchical enumeration of relevant indicator systems. studied the satellite comprehensive effectiveness evaluation methods and introduced the general effectiveness evaluation process, and proposed an improved fuzzy reasoning effectiveness evaluation method, which is based on the fuzzy reasoning of the original single factor evaluation index, besides a multi-factor comparison between indicators is added and combined with analytic hierarchy analysis. Finally, the actual navigation satellite is taken as an example for simulation analysis. The analysis results show that the method is feasible and the effectiveness evaluation result is correct and effective, which provides guarantee for the complex satellite system to improve its comprehensive performance.