Abstract: The slip ring is widely used in the spacecraft SADM, and it is one of the key channel for the energy supply and the signal transmission in spacecraft. A number of spacecraft failures were reported to be caused by the arc discharge of the slip ring, where as the tiny particles such as the wear debris are the main cause for the arc discharge. To study the effect of the wear debris on the aerospace disc slip ring, a vacuum arc discharge test is designed, and conducted under a vacuum system, with real products and an operating voltage of 60 V and 34 V, respectively, to determine the vacuum discharge characteristics of the slip ring. It is verified that the wear debris and the voltage have an important influence on the vacuum arc discharge of the slip ring. The discharge will cause large areas of ablation inside the slip ring, resulting in short circuit or open circuit between the solder joints, and between the solder joints & the inner ring, to damage the product’s insulating property. According to the test results, some suggestions are put forward for preventing the discharging of the disc slip ring in the design and the application.