Abstract: Dielectric internal charging caused by energetic electrons will cause anomalies in Geosynchronous satellites, so it is an important problem faced by satellite designer. In recent years, many statistical studies have been conducted in this area. In this paper, Monte Carlo method has been used to simulate the charge deposition in the dielectric caused by energetic electrons. The electric field in the dielectric was calculated as the function of injected electron energy, thickness of shielding and dielectric. It is found that the electric field induced by the deposited charges in the dielectric has significant correlation with these three factors.