Due to the fact that the current turbulence model is not intended for the numerical simulation of aerodynamic especially, there will be some potential calculation errors in this process. In order to find the suitable numerical model, taking the 1/3 proportion Mira ladder model as the research object, a numerical simulation test has thus been carried out of three normal vortex viscous turbulence models, i.e. Standard k-ε, RNG k-ε and Realizable k-ε, with the obtained statistics of the aerodynamic drag coefficient, the tail flow field and the surface pressure coefficient as the applicability evaluation indices, which are then compared with HD-2 wind tunnel test data. The results show that the convergence speed and efficiency of the Standard k-ε model are the best among three models, while with the least accuracy in its aerodynamic drag. The performance of RNG k-ε model is general. The realizable k-ε model has the highest aerodynamic drag calculation precision, with its error less than 5% compared with the wind tunnel test results. However, the convergence rate and efficiency are relatively poor. Meanwhile, the results of the three turbulence models are quite different from those of the wind tunnel experimental data.