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Starting performance in high altitude environment is an important index to evaluate plateau environmental adaptability and mobility for universal motor vehicle. To the starting difficultly of many types of vehicles in high altitude environment,based on systemic the process dynamics analysis of vehicle starting,the influencing factors of starting performance in high altitude environment were analyzed form two aspects--vehicle driving force and resistance force. Through proving test to the starting performance in high altitude environment of a certain tracked vehicle,the key influencing factors are identified including engine torque characteristics at low speed,transmission oil temperature,running slope and operation mode,which provide evidence for demonstration,development,test and operation of vehicles.