Abstract: Radar community paid much attention to spaceborne sparse aperture GMTI radar systems in recent years due to its high detection performance and adaptability compared with other airborne systems.In this paper, we apply some typical STAP algorithms to simulate the performance of spaceborne sparse aperture GMTI radar with antenna elements distributed uniformly and linearly along the track,at the same time,we also analyze detection performance under the influence of aperture position error and the change of CPI and PRF.