Abstract: The impact energy of the traditional pendulum impact test equipment is too small to generate a high magnitude impact for large products. In this paper, a pneumatic impact test system is designed, which can produce a high-magnitude shock response spectrum for the impact test of the high-mass spacecraft. The principle and the method for designing the system are presented, including the double impact cylinders and the double storage cylinders, as well as the impact hammer adaptive technology and the table reset technology. The test results show that the technical specifications of the system can meet the design requirements.