This paper introduced the problem of traditional power system in terms of reliability, this design using DSP to detect and control the power system module, through bypassing fault module and accessing normal module to improve the reliability of the whole power system. The comprehensive utilization of the system of digital and analog circuit, so that the traditional space power intelligent to achieve high reliability, using digital chip for the management of the power supply module, improves the precision and service life of the module. Through the test, the power supply system achieved the isolation and redundancy design of the module, for voltage regulation scheme, making point by point acquisition, realized module regulating control, verified the feasibility and correctness of the design.