Abstract: The large plastic deformation of aluminum alloy sheet will occur during bending forming, accompanied by the formation and development of shear bands, which reduces the plasticity of the material. The three-point bending model of superfine grain 6061 aluminum alloy was established based on the crystal-plastic finite element method and the sub-model method. The three-point bending experimental results measured by DIC（digital image correlation）were compared with the simulation results, and the dependence of the formation and development of shear bands on the strain rate was explored. The results show that: the established three-point bending model can accurately simulate the experiment; the formation and development of shear bands are obviously dependent on the strain rate.