The finite element simulation model of 3D transient temperature field and deformation field under different power was established for the process of laser forming of 2 mm-thick 6061 aluminum alloy sheet.The simulation results are consistent with the experimental results.Both the temperature and deformation increase with the increase of power, the reason of deformation is the temperature gradient mechanism and the microstructure transition of the material in forming zone.Through the observation of the structure of 6061 aluminum alloy sheet in the processing area, the visible boundary line was observed between the processing area and material matrix, and a large number of microcracks were produced on the boundary line.The microstructure of processed region is denser than that of the matrix, and the hole defect is significantly reduced, while carbon concentration region is produced in this region.