In order to solve the problem of foil rotation with variable angular velocity,the problem of foil rotation is studied.Firstly,the influence of aerodynamic damping on foil rotation is analyzed,and the foil motion model and rotation model are established,and the aerodynamic coefficient of foil is calculated by CFD.Then,the rotation angular velocity of the foil is calculated by the high-speed camera,and compared with the simulation results of the rotating model； the accuracy of the model is verified.Finally,the rotational characteristics of foil and the motion diffusion process of foil cloud are simulated and analyzed.The conclusion is that the rotation of foil affects the motion process of foil and determines the motion diffusion performance of foil cloud.