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Power supply security runs through the whole satellite integrated test period. It is a key work of space quality control to improve power security and avoid equipment failure caused by low-level problems. In order to improve the power supply security , combined with typical trouble cases encountered in practice , inductive analysis of universal key processes in test , the change of bus voltage build-up and unified management bus power-up time less than 300ms , battery package optimization design and PDU short-circuit faults self-inspection on power-up, .After practical application these technologies can greatly reduce the security of power supply, meeting the engineering needs of satellite mass production and development ,as well as providing reference for the follow-up development.