The geosynchronous earth orbit space in plasma environment is very complicated.In the geosynchronous orbit plasma environment,the energy distribution of space particles is very wide,involving almost all energy plasmas,and the energy spectra of particles are not exactly the same.The energy and distributions under different geomagnetic conditions are also different.When the geosynchronous earth orbiting spacecraft interacts with high-energy particles in the environmental plasma,a large amount of charge will deposite on the surface of the spacecraft which build an electric field in different surface.When the absolute potential of the surface of the spacecraft or the differential potential between different surface reaches the threshold,it will cause an electrostatic discharge,and the arc generated by the electrostatic discharge will directly affect the physical characteristics of the spacecraft surface materials and surface equipment normal operation,and it will also indirectly affect the internal circuit of the spacecraft in a coupled manner.Surface charging can be divided into two types:absolute charging and differential charging.Absolute charging refers to the charging of the spacecraft surface directly determined by the space environment and material characteristics.Differential charging refers to the potential variety determined by surface potential of different spacecraft surfaces.Based on the spacecraft surface charging simulation software developed by the European Space Agency,this article work simulated the surface charging of a geosynchronous orbiting spacecraft in a plasma that obeys a bi-Maxwell distribution.The change of the total surface current of each part of the spacecraft and the role of each particle current in the charging process were calculated and analyzed.The potential distribution of the surface of each part of the spacecraft and the effect of the space potential distribution on the charging effect during the charging process of the spacecraft were given.