To optimize load correction coefficient, based on press straightening control strategy with multi-step three-point bending process, two methods of least squares curve fitting and equivalent bending deformation energy were proposed. The simulation results of the Longitudinally Submerged Arc Welding(LSAW) pipe show that the optimum load correction coefficient calculated by least squares curve fitting method is bigger than normal. This is due to that, when the actual loading moment is greater than the theoretical straightening moment, the impact on the pipes is greater. However, the optimum load correction coefficient calculated by the equivalent bending deformation energy method, is more applicable, which is verified by the straightening physical simulation experiments of small sized pipes with different geometries, initial deflection distribution and straightening step. The straightness of the pipes with their initial straightness of 4‰~10‰ can be improved within 1.1‰. Thus, this method provides a convenient way to carry out the press straightening control strategy with multi-step three-point bending process.