Abstract: To solve the problem of extremely high temperature in some important components of the engine on the DFH-4 satellite platform caused by me high temperanlre of the second generation 490 N engine uIlder worldng conditions, a thermal control scheme about the engine is pmposed. Methods such as the thermal isolators, the heat insulation screen for high temperature, the heat protection cover and the sue surface controlling are adopted, and the memal control design is validated by me themal analysis tool of software TMG. It is shown that the maximal temperature of the docking structure is 57. 5℃ when the engine is workjng, and it is quite lower man its upperlimit of temperature(70℃). The thermal distortion of the bracket is also within the requirements. Thermal control desgin thus validated.