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In the orbiting environment, the thermal environment changing of optical system will affect the quality of Remote Sensing image,so it is very important to control thermal environment of Space Remote Sensing Camera for its normal work. For making sure the Space Camera working temperature is stably and reliably, this article gives a scheme that management function and thermal controlling module are controlled by DSP in space camera,which thermal controlling way apply a intergral -separation PID algorithm. It demonstrated that this means could be applied in engineering with laboratory equipment,and have a control accuracy of 0.3degree Celsius.This system overcome the low-precision characteristics of traditional temperature control.