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The aerospace craft is developing rapidly , with the increase of the number of electrical equipment and the complexity of flight mission , the intelligence level and reliability of the aircraft power distribution system are facing higher requirements . The distributor is the core equipment of the distribution system, which distributes electric energy for all electric load equipment of the aircraft, and its performance directly affects the success or failure of the mission, the BIT ( built - in test ) technology is an important method to improve the performance and diagnostic ability of system or equipment . The overall scheme of the power distribution system based on the solid state power controller is studied , the failure modes and testing methods of the solid state power controller are analyzed, the design and optimization methods of test points are proposed , the calculation results of fault diagnosis ability show that BIT design technology can improve the reliability and intelligence of distribution system.