Abstract: High temperature might damage the spacecraft cables and even harm the safety of the spacecraft power supply. To build a temperature rise model of the spacecraft cable, a temperature test for cables was designed and carried out. The test data were analyzed according to the radiation law of the cables, and the model of describing the temperature rise of the cables was obtained by the least squares method. The model, validated by the simulation with its predicted temperature being very close to the measured temperature in the test, can be used in the optimization design of the spacecraft cable network, the balance of the payload of the spacecraft in orbit, and the inverse-time protection of the spacecraft cables.