Abstract: The space debris, such as the expired satellite, is affected by various disturbances and characterized by its spinning motion varying from several degrees to tens of degrees per second. It is difficult to directly grab and remove the space debris due to the spinning motion, so that despinning is required. The electromagnetic despinning method is widely applied due to its noncontact and noncollision characteristics. However, the interaction force and torque between the geomagnetic field and the source magnetic need to be studied firstly. In this paper, an electromagnetic despinning method based on the rotating magnetic field is introduced. The geomagnetic perturbation force and torque are modeled, and the distributions of the geomagnetic perturbation force and torque are simulated. It is shown that the source magnet with a segmented structure and an optimized magnetization distribution can help to offset the superposed geomagnetic moment and reduce the geomagnetic perturbation.