Abstract: Space deployable antennas may be impacted by high-speed space debris. To study the dynamic response of antenna support structure under high-speed impact, a dynamic impact model of large aperture modular space deployable antenna support structure is established by using ANSYS/LS-DYNA. Based on the high-speed impact test on the spherical reticulated shell structure, the validity of the structural impact dynamic model is verified. An effective equivalent model of impact dynamic analysis is proposed by comparing the calculation results with the dynamic model, and the effects of different impact locations and velocities on the dynamic response, failure mode and deformation behavior of key members and the whole structure are analyzed. The results show that a closer impact point to the structure centroid leads to a larger impact area. Small local depression or breakdown occurs in the impact area, and the overall stability of the structure is good. The maximum deformation of antenna structure usually occurs at the impact point, and the most adverse impact point is the farthest from the constraint, where the safety measures should be taken. As the impact velocity increases from high speed to ultra-high speed, the overall deformation of the support structure increases at the impact point, but the impact response region increases initially and then decreases. When the impact velocity is 20 km/s, the rod suffers shear failure rapidly and the deformation area of the whole structure is minimum.