The establishment of scientific finite element mode for soil plays a pivotal role in simulating and analyzing the landing impact of space capsule. The LS-DYNA was used to simulate the landing process of space capsule, and the effect of main parameters in soil mode on impact characteristic was analyzed through orthogonal test. The results demonstrate that bulk modulus and parameter A2 significantly influence the maximum impact acceleration and pulse width, parameter A0 A1 and their interaction are not significant. These conclusions can provide some references to both the study on ground test in the landing process and the structural optimization of space capsule.