Abstract: To study satellite thrusters for attitude control and orbit control, the DSMC method is used for plume contamination modeling on satellite sensitive surfaces, in simulating nitrogen plume flow, and the results are compared with those of existing experiments. The reliability of DSMC method for the plume simulation is verified. Then, the results of the DSMC simulation are compared for different model parameters of plume contamination, which may offer references for studying plume back flow contamination on the sensitive