It is ineluctable in stereo vision that a large numbers of error matched pixel will be present. The quality control after matching is a general method for detecting error matched pixel. This paper described a method for further improving the veracity of matching. A constraint of epipolar line bunch based on Radial Geometry and continuity suppose was given to detect the similar matched pixel and weed out the error pixel by using correlative information of the pixel. The experiment proved that the constraint has better ability for weeding out error pixel. It increased the veracity of matching.