Abstract: The heat power simulation system is used for simulating the amount of heat in satellite-equipment in heat balance experiments, to check the performance of the whole satellite under heat control. In this system, the main part of the control unit is DSP microprocessor, and the communication is conducted with CAN bus. Adjustment, cycle-check and recording of the power of each way are controlled by computer, and each power-out can be automatically adjusted depending on the preset curve.