A method for terrain simulation flying of an Unmanned Aerial Vehicle, UAV, comprising: acquiring a vertical distance between a UAV and the ground; acquiring an oblique distance between the UAV and the ground; acquiring an angle between the vertical distance and the oblique distance; and adjusting a terrain simulation flying state of the UAV according to the angle, the vertical distance and the oblique distance, wherein the step of adjusting the terrain simulation flying state of the UAV according to the angle, the vertical distance and the oblique distance comprises: calculating one or more items of judgment data by using the angle and the vertical distance; composing one or more judgment data ranges by the one or more items of judgment data; and adjusting the terrain simulation flying state of the UAV according to a judgment data range within which the oblique distance falls; characterized in that the judgment data ranges comprise a first judgment data range, and the step of adjusting the terrain simulation flying state of the UAV according to a judgment data range within which the oblique distance falls comprises: in a case that the oblique distance falls within the first judgment data range, maintaining a terrain simulation flying speed of the UAV, and adjusting a terrain simulation flying height of the UAV according to the vertical distance. acquiring a vertical distance between a UAV and the ground; acquiring an oblique distance between the UAV and the ground; acquiring an angle between the vertical distance and the oblique distance; and adjusting a terrain simulation flying state of the UAV according to the angle, the vertical distance and the oblique distance, wherein the step of adjusting the terrain simulation flying state of the UAV according to the angle, the vertical distance and the oblique distance comprises: calculating one or more items of judgment data by using the angle and the vertical distance; composing one or more judgment data ranges by the one or more items of judgment data; and adjusting the terrain simulation flying state of the UAV according to a judgment data range within which the oblique distance falls; characterized in that the judgment data ranges comprise a first judgment data range, and the step of adjusting the terrain simulation flying state of the UAV according to a judgment data range within which the oblique distance falls comprises: in a case that the oblique distance falls within the first judgment data range, maintaining a terrain simulation flying speed of the UAV, and adjusting a terrain simulation flying height of the UAV according to the vertical distance. calculating one or more items of judgment data by using the angle and the vertical distance; composing one or more judgment data ranges by the one or more items of judgment data; and adjusting the terrain simulation flying state of the UAV according to a judgment data range within which the oblique distance falls; characterized in that the judgment data ranges comprise a first judgment data range, and the step of adjusting the terrain simulation flying state of the UAV according to a judgment data range within which the oblique distance falls comprises: in a case that the oblique distance falls within the first judgment data range, maintaining a terrain simulation flying speed of the UAV, and adjusting a terrain simulation flying height of the UAV according to the vertical distance.