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Low temperature starting performance is an important indicator of the dynamic performance of vehicles. For vehicles with hydrodynamic-mechanical transmission, due to the technical characteristics of integrated transmission, not only engine starting resistance but also integrated transmission starting resistance should be considered to improve vehicle starting performance. The main features of the engine start process are summarized and the bench test method combining steady-state test and dynamic test is proposed to be used to test the starting torque of integrated transmission based on a systematic analysis of technical characteristics and power flow of integrated transmission. Taking a high-speed tracked vehicle as the object, the starting torque of integrated transmission is tested. The results indicate that the change of transmission oil temperature and the power consumption of various types of pumps are the key factors that determine starting torque of transmission, which provide a basis for improving overall design and starting performance of vehicles.