Laser triangulation is one of the most important 3-D sensing profilometries.Because of the influence of image speckle, the determination of the centroid of light spot in CCD surface is limited. This causes the depth resolution decreased. In this article, we present a method that is based on the lateral shift of the object. When the shift distance reaches to the diameter of the point spread function, the correlation of the centroid line of laser sheet is decreased evidently. We increase the depth resolution is increased one time while the lateral resolution is deceased only 18%.