In order to study the influence of wind load on the separation movement of the tail cover, an aircraft launching model was established, using unstructured dynamic mesh technology of spring approximation combined with mesh reconstruction, rigid coupling solution hydrodynamic equations and the equations of motion six degrees of freedom, the numerical simulation of the separation process of tail cover of the cold launching was carried out.By calculating the unsteady process of the tail cover separation under two different wind speeds, the influence mechanism of wind load on the attitude angle and landing distance of the tail cover is analyzed.The results show that the wind load will cause a significant change in the pitch angle of the tail cover, which will make the tail cover farther away.This result can be used as the basis for setting the safety distance.