Abstract: When a ship is navigating at sea, rotor wakes of helicopters on the deck and airflow on the surface of the ship mix with each other to form complex flow, which will not only affect the take-off and landing of the helicopter, but also affect the safety of personnel working on the deck. In this study, the aerodynamic force of a human body model was analyzed by means of numerical simulations, and the range of wind speed affecting the safety of the personnel was put forward. The flowfields of four different ships, namely France Mistral-class LHD, France Charles de Gaulle, Britain Queen Elizabeth-class aircraft carrier and the American LHA, were numerically simulated. The safety of personnel on different ships were analyzed based on the wind speed range, while the dangerous area for personnel on the deck and their causes were also summarized. On this basis, numerical simulations of helicopter/ship coupled flow were conducted, including helicopter approaching the LHA, helicopter landing on the LHA as well as multiple helicopters landing on the LHA. In addition, the high-speed airflow field on the deck and the dangerous area for personnel on the deck were analyzed and summarized.