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In the spacecraft vacuum thermal test temperature measurement is the most widely used thermocouple temperature measurement system. The temperature reference point is an important part of the thermocouple temperature measurement system, and it has a great impact on the accuracy of the temperature test data and the safety of the spacecraft products. In order to verify the correctness of the matching relationship between the platinum resistance and the compensation point of the hot spot before the start of the thermal test, a thermocouple temperature reference test system for thermal test was designed. The system consists of a heater and a control box, which can be connected to a host computer via a LAN network for thermal response remote testing. In this paper, the thermal analysis of the reference point device and the thermal response test principle analysis, given the system hardware structure and software design, and in a number of spacecraft vacuum thermal test put into use, improve the spacecraft vacuum thermal test thermocouple Reliability of temperature measurement system.