Aiming at the evaluation problem of combat capability for integrated electronic warfare system, established the index system of evaluation problem for combat capability of integrated electronic warfare system through the structure and combat flow. According to the relationship between indexes of upper and lower layers, two kinds of models for index aggregation are given. Aggregation relationship of each index of combat capability for integrated electronic warfare system’s index system is analyzed, evaluation model of combat capability for integrated electronic warfare system is obtained .The result can give a reference to collocating and using of the integrated electronic warfare system.