Abstract: On the basis of the component of node thermal network equation in spacecraft and combining design feature of actual mechanism, a parametric node group thermal network combined equation whose physical meaning is definite was established and the correction technique of thermal network model for spacecraft was made on this basis. The extrapolated formula for calculating temperature that is based upon hot tests and basic principle of heat transfer can be used for determining those node temperature on which there are not measuring points, so the difficult subject is solved that measuring point in temperature is not enough during hot test and the model correction can not be put into effect. Using this correction model, calculating values whose errors are in permissible range can be conducted.

Key words: thermal network model correction, spacecraft, node group combined method, thermal analysis