Abstract: The ground power supply system is important in the electrical ground support equipment for satellite integration test. The paper discusses a ground power supply test system for satellite constellation. The system uses the configuration technology, based on PROFIBUS, PLC, STEP 7 and WinCC, to realize the functions of real-time display, control and output, alarm record, data archiving, redundancy backup, with features of high reliability and powerful extensibility. It represents an effective way for the modularization, generalization, serialization of the test equipment, to meet the demand of overall testing of satellite constellation.