Abstract: The deep charging and discharging of spacecraft dielectrics caused by high energy charged particles under complex space radiation environment is one of the main factors leading to the failure of spacecraft. Studies have shown that the composite materials with nonlinear I-U characteristics can inhibit deep charging and discharging of spacecraft dielectrics are inhibited. In this paper, the feasibility of nonlinear conductivity polymer materials inhibiting deep charging and discharging of spacecraft dielectrics were analyzed. Besides, the conductive mechanism, modification method and application of nonlinear conductivity polymer materials were introduced. The research prospect and development trend of nonlinear conductivity spacecraft dielectrics were expounded. The results show that the nonlinear conductivity of composites is affected by a variety of charge transport mechanisms. The preparation technology of nonlinear conductivity composites has been improved, and a breakthrough has been achieved from simple material preparation to simulation calculation and ground-based simulation for space environment. The next key research contents will include conductive mechanism in space environment, the collaboration between material preparation and simulation calculation, experiment, and the optimization of simulation model and multi-source simulation experiment conditions.