A hit by a falling of a metal box is a canonical contact problem. This article uses ABAQUS software to analyze the collisional procedure about the dropping of a metal box in four types of ground contact as triangular bulge, semicircle arc bulge, rectangular bulge and plane, and then compare different mechanical behaviors of the contact-material in different types of contact, which bores out the symmetry of symmetrical structures loaded symmetrically in Structural Mechanics. Besides, it has analyzed effects made by different types of contact on time which needs to re-balancing contact, stress concentration and engineering application of contact problems.