To obtain the desirable shape for the complicated curve surface forming, it is necessary to place the laser scanning lines on different positions of metal plate. However, the deformation of plate is different when the heating position varies. In this paper, effect of the heating position on deformation behavior of the plate is discussed under the temperature gradient mechanism and the buckling mechanism in order to optimize the process parameters in industrial applications. The results suggest that under the temperature gradient mechanism the heating position has a little effect on the bending angle of the plate when the laser scanning line is far away from the fixing edge, while the effect of the heating position on the bending angle is great when the laser scanning line is close to the fixing edge. Under the buckling mechanism, the heating position has an effect not only on the bending angle of the plate, but also on the bending direction of the plate. Therefore, to acquire more precise parameters for the complicated curve surface process planning, the effect of the heating position on the deformation must be considered when building the basic relationship database between process parameters and plate deformation.