Abstract: In the thermal vacuum test, for the test product with a large thermal capacity, or an internal heat source, the introduction of heat conduction might enhance the temperature control capability of the test. An engineering solution is to develop a kind of temperature control platform for the product tobe heated or cooled rapidly. During the test, the product is fixedon the installation panel of the platform, and the cold boundary is provided by the cold plate filled with liquid nitrogen at the bottom of the platform. Amulti-channel temperature control system is used to control the temperature of the platform, so thatthe temperature of the product may vary in accordance with the platform. The thermal simulation of the structural design of the platform is conducted, and validated by the follow-up test.The platform has been successfully applied in the thermal vacuum tests of some unit products, realizing the desirable temperature stability and cooling rate.