Based on geometric curvature method， the scanning path planning for laser bending of straight tube, AISI304L stainless steel, into a bent tube in a plane or three-dimension curvature was researched. To two dimensional(2D)laser bending tubes, the tube is divided into several segments according to the extreme point and inflection point of the desirable tube, taking the extreme point as the initial place of the path planning, using different scanning space for every subsection in order to identify the heating/scanning paths. In order to 3D laser bending of tubes using projection decomposition method, three-dimensional surface is decomposed into two two-dimensional curved surfaces, the scanning path planning and process parameters were thus acquired respectively. Through combining two groups’ data, the 3D heating/scanning path planning was obtained. Finally experimental verification is carried out by using a typical complex sinusoidal surface and helical coils of three-dimensional shape as the desirable shape on Nd∶YAG solid laser , scanning bending results show that in the paper scanning path planning method is effective and feasible.