In order to study the influence of simulation models with different modeling methods on the calculation efficiency and results of shunting impact, longitudinal dynamics, three-dimensional refined and hybrid dynamics were established to simulate the shunting impact condition according to the parameters of C80 convertible and MT-2 buffer, and the response results of shunting impact under different speeds, empty heavy vehicle states and different marshing modes were analyzed. On this basis, the modeling convenience and computational efficiency of the model are discussed. The results indicate that: (1)With the increase of impact velocity, the maximum coupler force obtained by the three models changes in the same trend, but the difference between the results becomes larger and larger. For example, the simulation difference can reach 15% at 8km/h; At the same time, the maximum difference of analysis results under empty condition is 8.9%, which is larger than the simulation results under heavy condition of 2.4%. (2) The time history of coupler force obtained by different grouping methods is similar, and the maximum difference is about 8% in different coupler positions. (3) There are difficulties in the modeling convenience, but the database of model A is more convenient to call on the interface, and the calculation time is much less than that of the other two models.