Relative movement model of two satellites was mainly researched in space-based surveillance by geometry principle and vector calculation tool. On one hand, satellite orbit can be described clearly using a kind of producing rule of satellite orbit that is different of orbit elements and solving mechanics equation. On the other hand, relative directions of two satellites in the movement are researched by combining opto-electrical tracking system. Corresponding results of satellite orbit, relative distance, azimuth angle, pitching angle, azimuth angle velocity and pitching angle velocity were achieved after computing relative movement of two sun synchronous orbit satellites on different planes and two geosynchronous orbit satellites on the same planes. Analysis results show that this method is reasonable and provides qualitative and semi-quantitative reference for some physics question and key technologies in space-based surveillance such as design of satellite orbit, selection of work region, design of surveillance system and acquisition tracking and pointing control system.