In the process of impact test, the speed and acceleration of the motion parts are very high, and the impact load is great. Therefore, the requirements for structural design, rigidity and strength design, location accuracy, machining accuracy, deformation, high-speed coordination of mechanism, vibration, reliability and fatigue life are very high. The three-dimensional dynamic displacement measurement system can accurately measure and analyze the dynamic characteristics of the above mechanism, and provide technical solutions for solving the technical problems encountered during the impact test.