In response to the difficulties in the current in-service assessment and evaluation, a comprehensive evaluation method based on intuitionistic trapezoidal fuzzy multiple attribute decision making is proposed. The concept model of in-service assessment is constructed, and its basic connotation and evaluation indicators are elaborated. The in-service comprehensive evaluation matrix is constructed, and the linguistic evaluation matrix is converted into a standard evaluation matrix using intuitionistic trapezoidal fuzzy numbers. The weight of each indicator combination is calculated using AHP and entropy weight method. The TOPSIS method is used for comprehensive evaluation to obtain the in-service comprehensive evaluation results of communication support equipment. Simulation results show that the method is reasonable and effective in the application of in-service evaluation and comprehensive evaluation of equipment.