The servo system of spatial laser communication terminal is a kind of tracking mechanism with high precision. Under the disturbance condition,the communication system has higher requirements on the stability and accuracy of the tracking system.This paper mainly introduces the composite tracking technology of laser communication servo system,discusses the choice of single detector composite tracking mode and the control flow of laser communication servo system in detail.Finally,the laser tracking experiment of coarse and fine tracking was carried out on the vibration platform.Experimental results show that when the communication terminal system track the maximum vibration acceleration of 0.22°/s2,the tracking stability is better,and the coarse tracking error is 60 μrad,and the position tracking error can reach 2 μrad when the combination of coarse and fine tracking mode is used.Experimental results also show that the design of single detector compound tracking technology can meet the requirements of system tracking accuracy in the spatial laser communication system,and also provides some reference for the design of laser communication control system.