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Ground cable has become more and more with increasing number of developing small satellite. It will cause a great loss once hot breakdown happens as insulation aging. As one of the important parameters, the temperature of ground power supply cable is necessary to be monitored. Therefore the paper developed a ground cable temperature monitoring system, it adopted T-type thermocouple to monitor the important positions of the power supply cable, transfers data to RS-485 signal through DAQ box, connects to test network using serial server and Ethernet switch, realizes convenient access, developed monitoring software based on LabVIEW to real time monitoring and other comprehensive application. Finally, a current carrying test of this type cable has to be done in order to obtain current carrying data , and the test data further indicates the important of cable temperature.