Abstract: The approach of applying stereo vision technology on measuring distribution of tree with stereo image couple was introduced in detail and the procedure of stereo vision which fit for forestry environment was explored. The camera calibration based on nonlinear error in measure model was adopted and the interactive correlation matching constrained by epipolar line and edge of tree detected by Canny operator was used.The algorithm and maneuver in this paper were illustrated.Results proved that application of stereo vision technology on measuring distribution of tree could meet precision need in experimental conditions.