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For the problem of laser spot detection in the turbulent atmosphere in the case of Long distance communication，a laser spot tracking system is designed，The system's hardware structure, working principle，system tracking control algorithm and optical spot image processing algorithm are studied.First，according to the system hardware structure and the practicability of the control algorithm，the PI algorithm is selected as the tracking control algorithm of the system.Then, in order to improve the speed of algorithm in the spot image processing，we choose the improved median filter algorithm to process the spot image collected by the system.Then, in terms of threshold segmentation, in order to get more accurate grayscale images，the system uses iterative method to select the threshold, and then thresholds the image.finally，the laser spot tracking experiment of 5.2km is carried out with this system，and the results of the experiment are analyzed，the experimental results show that shows that the system can track the light spot steadily，and the tracking precision can reach 5.4,it meets the requirements of the space laser communication system for the tracking system.