To study the lever-arm effects of missile, considering the missile missile-borne SAR under the premise of cost-effective, and the direct use of the motion parameters output from missile’s IMU,this paper designed SAR platforms without INS equipment, and got the actual SAR antenna center movement information, which was used to the SAR antenna center movement compensation. The motion transfer relationship of initial navigation to the antennary center was built up by considering of the vibration and lever-arm effects, and simulation analysis of validation was made.