When a UAV is about to land on the deck of a carrier based on computer vision technology,it is necessary to consider whether its flight trajectory is reasonable and whether the motion of corresponding visual feature points in the image space is reasonable,which means the feature points should be in the field of view of the airborne camera.In addition,due to the influence of external disturbances such as sea wind and waves,it is difficult to obtain suitable parameters to make the visual feature points move along the desired trajectory and make the image errors converge in a desired dynamic process.To solve these problems,a visual guidance method is designed,which makes the trajectory planning based on the strategy of tau coupling compatible with Image-Based Visual Servoing (IBVS).Meanwhile,Prescribed Performance Control (PPC) theory is introduced to explicitly describe the dynamic process of image error convergence,and to endow parameter tuning with an explicit physical meaning,thereby reducing the difficulty of parameter tuning.Finally,the feasibility and effectiveness of the proposed method are verified by the simulation experiments.