The influence of scanning passes on laser bending process was studied for the plates with 6 mm and 9 mm thickness at different laser parameters. A three-dimensional coupled thermo-mechanical finite element method (FEM) model was developed to calculate the variation of temperature field, stress field and bending angle during multiple-irradiation laser bending process. Real-time temperature and bending angle were measured. The simulation results were in agreement with the experimental results well. The simulation results showed that the temperature distribution was similar between each irradiation. Residual stresses and bending angle were increasing with the increase of laser scanning passes. The bending angle of 6 mm thickness plate decreased as the irradiation number increasing, while that of 9 mm thickness plate increased linearly. Laser parameters affected the extent of strain hardening on the underside of the steel plate. Under different laser parameters, the bending angle of various thickness plates has dissimilar relationship with the laser scanning passes.