Aiming at the 2H/2E civil aircraft hydraulic energy system of 35 MPa pressure system independently developed by China, the thermal analysis model of hydraulic components was established in AMESim software based on the heat generation and heat dissipation mechanism of key hydraulic components such as hydraulic pump, hydraulic user, hydraulic pipelines and selfpressurized oil tanks. On this basis, a complete set of hydraulic energy system thermal model was established, and its thermal performance was analyzed under normal operating conditions, and the thermal simulation analysis results of normal operating conditions during hot day flight, hot day hovering at low altitude and cold day flight were obtained. The simulation results were compared with the system temperature requirements. The results show that the simulation model has high accuracy and the modeling method is universal, which can be used for the demonstration and optimization of the civil aircraft hydraulic energy system at the beginning of the design.