Abstract: The effects of electron ring-beam on the satellite surface potential and plasmasheath in magnetized plasma of low earth orbit are studied by means of 21/2-Delectrostatic code. The simulation results show that the satellite is charged negatively when there exists electron beam, and the increase of the density and velocityof electron beams increase the absolute value of satellite negative potential. Whenelectron ring-beams are injected in an oblique angle with respected to the magneticfield, the effects of electron ring-beams decrease when the oblique injection angleincreases from 0° to 90°. The plasma sheath becomes wider when there is electronring-beam and its shape changes from "tear drop" to "fan".