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The performance evaluation of the powertrain system holds significant guidance in the process of equipment test and evaluation. The electromechanical composite drive system possesses characteristics such as multi-power source collaboration, efficient multi-mode power supply, high structural complexity, and integration. These characteristics determine that existing evaluation methods cannot provide perfect and sufficient performance evaluation results; The objective is to fully meet the verification and assessment requirements for system design, matching, control, durability, and other system indicators as well as component performance indicators. It is based on a comprehensive index system for evaluating the overall performance of electromechanical composite transmissions. It investigates evaluation methods for both system-level and component-level performances of electromechanical composite drives while determining different weights for each indicator through comprehensive weighting techniques. Evaluation methods are presented for various components such as engines and generators.