To seek for new measure way of saddle of bearing the weight, and replace the traditional way with handwork, a kind of untouched measure system by use of the technology of image calibration and measure is proposed, the operation principle is introduced, the method of image processing in this system, and the factors which result in measuring error are analyzed. The experimental results meet the requirement and the measure speed is faster, the method is valid and novel, and it provides new idea for other objects′ measure.