The two dimensional coding plane is made of squares with three different colors that are red,green and blue.The color squares are used as corresponding points in the stereo vision measurement by adhering on the surface of the measured object.We can obtain the chromatic images of the measured object by use of two sets of optical imaging systems,and find out the corresponding points of two images by use of computer image processing technique.The three dimensional shape information of the object is based on the parallax of the corresponding points on two images.This method is most suitable for the three dimensional tracing measurement of the moving human body.