Stereo vision is one of the important branches in computer vision research. Among the techniques of stereo vision, people have paid more attention to binocular stereo vision which is based on processing two images. It directly simulates the manner of human eyes observing one scene from two different viewpoints. In this paper, binocular stereo vision technology is analyzed. Based on OpenCV, the important algorithm of stereo vision is achieved and the depth information of object is recovered by our program. By making full use of the functions of OpenCV, this method achieves better efficiency and accuracy of computation as well as good portability, which can be adopted in many types of computer vision systems. (4 pages)