Abstract: Power supply and distribution system as a spacecraft subsystem used to generate, store, control, transmit and distribute power, its ground testing is an important part of the spacecraft ground testing. Spacecraft power system is a typical DC distributed power system, the quality and stability of the power bus is closely related to the quality of spacecraft power system. Analyzes the testing methods of spacecraft power bus quality, gives a brief test system design and predicts technology trends.

Key words: Busbar quality, DC distributed power supply, Stability, Failure forecasting