3D reconstruction from the 2D grey image has been a research hot spot in the field of computer vision.After making an intensive study on the hot spot,a method according to the characteristic points of the profile curves to complete the reconstruction of the irregular object is proposed.The method extracts the irregular object from the 2D grey image as the research target and adopts corner detetion and the detetion-threshold to acquire main characteristic points and subprime points.According to the main points to deterimine the matching ralationship of the profile curves,thereby the segmentation-concatenation is completed,according to the suprime points and the shortest diagonal ooptimization strategy,the triangular plane-concatenation is finished,finally,the 3D reconstruction of irregular object surface is ralized.The experiment indicates that the method could conveniently reconstruct the 3D shape of the irregular object according to its 2D grey image.