Abstract: Space microparticles may adhered to the satellite camera might disrupt its detective performance. When the impact velocity of mocroparticles is lower than the critical adhesion velocity, the microparticles will adhere to the surface of the satellite camera. It is significant to determine the critical adhesion velocity and find the factors that affect the critical adhesion velocity with regard to the space pollution. Based on the simplified EA model, the adhesion force and the critical adhesion velocity of copper and graphite microparticles during the impact process are simulated and analyzed. The results indicate that the surface roughness correction factor is an important parameter influencing the adhesion force and the critical adhesion velocity. Under the same conditions, the graphite microparticles, even though its largest adhesion force is smaller than that of copper particles, has a higher critical adhesion velocity than that of copper particles, suggesting that graphite microparticles are more likely to adhere to the surface of the camera.