Abstract: As the most commonly used structure of dielectrics in the satellite, the electric cable is protected only by the satellite skin, its internal charging-discharging must be considered as an important issue. The charging of several types of cables in the GEO satellite is analyzed by using a three-dimensional simulation software, several typical structures such as the curved cable, the exposed cable, the cable fixed device are analyzed. It is shown that the charge can build up in cable dielectrics, and the charging potential will even increase to the breakdown point under some conditions.