The finite element software ABAQUS was used to simulate the processing of constant elastic alloy metal sheet by laser shock waves with semi-die process. The effects of pulse laser energy on metal sheet movement velocity and forming accuracy were investigated. The law of sample velocities in different regions at the same energy was discussed. The results showed that there was no collision between the metal sheet and the concave die when the energy was low. The central node vibrated around the equilibrium position,but the amplitude of vibration decreased gradually and reached zero finally. When the energy was high,the metal sheet collided with the bottom of dies severely,and then the sheet had a reverse movement. The velocity fluctuated slowly for some time and then reached equilibrium state eventually. A good quality waveform sample could be obtained by adjusting pulse laser energies. It was concluded that the software ABAQUS could predict metal sheet velocity in the laser shock forming (LSF) process,and it provides the reference for further study on LSF.