Abstract: In order to improve the problem of energy consumption in the low temperature heating system of a pure electric vehicle, through the simulation software AMEsim, this paper builds a hydraulic thermal management model based on the low temperature thermal management structure scheme of a pure electric vehicle heated by PTC heating, and verifies the reliability of the simulation results by the test data. The control strategy of the low temperature heating system is optimized, and a motor waste heat utilization model is added to the structure. The effects of ambient temperature, strategy scheme and driving conditions on the heating performance and energy consumption of the system are further analyzed through simulation. The simulation results show that the energy consumption of the optimized model reduces by 26.2% under two NEDC conditions, which increases the economy of the system.