Finite element models of both the concrete filled square steel tube and a Cuboid impactor were developed, incorporating ANSYS/LS-DYNA. Three stages of time history curve of the impact force of the concrete filled square steel tube including the impact stage, stable stalemate stage, the decaying stage were generalized according to its dynamic response. And with the wall thickness increased, the peak of the impact force and the platform value is also increase, with axial force increased, the peak impact force hardly changed, but the impact platform value have a certain extent lower. Then four stages of time history curve of the impact displacement were proposed according to the dynamic response of the impact of the concrete filled square steel tube based on numerical analysis, four stages include in elastic deformation stage, plastic deformation stage, elastic rebound stage, free vibration stage in the position of the residual deformation. Finally, time history curve of the impact force and displacement according to the dynamic response is analyzed under the impact of the corner of the concrete filled square steel tube, the results show that the anti-impact capability of 45 degree angle is higher than that of the front impact.