The speed and posture of moving targets are an important matter in range measurement, using mirror to solve the problem of short trajectory tracked by the fixed high-speed camera.According to the mov-ing discipline of projectile and relationship of imaging, the moving discipline of the mirror can be got, and so the eccentricity moment of the camera is zero any time.In addition there is another concern of motor and system re-quest to be considered.Finally this system can get a whole procedure of the flying projectile, the length of image is in the rang of1/5to3/5of the CCD length, the angle of tracking area can reach to 90°.