Abstract: To determine the temperature measurement points in the payload module of a telecommunication satellite, a semi-physical simulation method for the temperature measurement is proposed, combined with the setting of the finite temperature measurement points based on the thermal control boundary and the ground data mining, to replace the traditional approach of the direct temperature telemetry of the instrument, as well as to reduce the number of temperature measurement points in the payload module. The method is validated in a DFH-4 platform satellite. Compared with the traditional method, the number of temperature measurement points in the payload module can be reduced by 70%, with a weight reduction of about 6 kg, and the efficiency-cost ratio of the temperature measurement system design and development is optimized, down to 30% of the original value.