To investigate the characteristics of flow field on the flight deck for the frigate ship, and obtain the high accuracy data for the piloted flight simulation, isolated simplified frigate ship was calculated using FLUENT in this paper. Specifically, through reasonable mesh generation and validated solving method ,the impact on the calculation results with different grid forms as well as the Reynolds number was discussed, and the simulation applicability of different turbulence models for ship flow field was also analyzed. The spectral characteristics of votex shedding on the flight deck were captured accurately and calculation data accuracy for ship airwake was improved significantly. The results show that ILES model is more appropriate for the ship flow field simulation with higher accuracy requirements, and the numerical simulation method for ship flowfield also provides an important reference for engineering applications.