Abstract: This paper analyzes the monocular stereo vision algorithm based on bifocal imaging.In the depth range less than 1 meter,this algorithm demonstrates excellent recovery of objects' depth,and the farther the object point is away from the center area of the frame,the more precise the depth value will be.In order to improve the algorithm precision,the center point of a pair of zoom images needs adjusting if it is not an ideal pair.This paper introduces the method of center point adjustment and illustrates the experimental result of depth recovery of a spatial object after adjustment.