Intelligent secondary power supply is a power supply which integrate power conversion , data acquisition, power control ,serial communication features for aviation, aerospace high-reliability power supply system, with the diagnosis, fault protection and power health management function. Intelligent design is a necessary measures to ensure and improve the secondary power performance , is the trend of secondary power supply system of the future, It solve the shortcomings of traditional secondary power system such as poor monitoring , lack of fault identification and diagnostics, improve the reliability of the secondary power supply greatly, has great significance to improve the design of space payload.