In order to simulate an aircraft with high realism flight dynamics model, and after expansion, it can interact with other weapons in joint operation simulation. The paper develops a visual flight simulation system based on JSBSim flight dynamics model with Unity. The simulation system first analyzes the input data of the input device, then uses JSBSim flight dynamics model to calculate, and finally updates the aircraft attitude, position, speed and other information according to the calculation results. It can realize the functions of aircraft attitude control, state information and 3D terrain display. The experimental results show that the developed flight simulation system can effectively simulate the roll, pitch, yaw, refueling and other operations of the aircraft, and realize visual flight simulation of the aircraft. After expansion, the simulation system can also be used for aircraft simulation in joint operation simulation.