In the process of the rocket silo launching, the rock particles on launching site move toward the silo and may impact the rocket having out just in time under the action of high-speed airflow. In order to predict the damage of rocket skin, the model of vertically impact of rock particle on a thin plate is established by LS-DYNA, and the dynamic response of the skin is analyzed. The effects of stringer structures and rock particle velocity, volume and shape on the deformation of the skin are discussed. The results show that under the impact of rock particle, the elastic deformation of the rocket skin mainly occurs and the plastic deformation occurs in local areas，and the depth of the permanent depression is from 1 mm to 5 mm. The deformation displacement of the rocket skin is approximately proportional to the impact velocity and volume of the rock particle, and the damage caused by the cuboid rock particle is less than that of the sphere particle. The stringer structures can improve the impact resistance of the skin in a certain extent.