Satellite Laser Ranging(SLR) is an important method of high precise measuring distance between observation station and satellites.It can apply precise observed data for precise orbit-trimming and sat-ground timing synchronization.The paper firstly introduces the principle of SLR.Then the article analyzes the constituent parts and functions of SLRS on a system framework angle.The theory and course of laser subsystem,ranging optical subsystem,control subsystem etc.are explained in detail.At last,the testing results and precisions according to the system framework are given.The tests prove that SLR has higher position precision.It can satisfy the demands of national navigation and position system.