In order to reduce the effect of image motion on the image quality of space camera and to improve the resolution of camera, a compensation method of image motion to space camera is researched. The producing reason of drift angle and its adjusting principle are analyzed. Based on the characteristics of the camera, a fine compensation mechanism for motion image is designed. By taking a 80C31 as controller of drift angle,a step motor as actuating mechanism, and an absolute encoder as measuring component,the system realizes the closed-loop control of the drift angle position using transmissing form of sine agencies. Because the adjusting range of drift angle is between -4°～ +4°, this paper measures and obtains ten groups of practical data by absolute encoder in choosing -4°、-2°、0°、+2°、+4° as the expectation values of drift angle. Experimental results indicate that the drift adjusting mechanism can implement the accurate image motion compensation,and the accuracy of the drift angle can reach 2′,which can meet the accuracy requirement less than 3' for control system.