Based on head pursuit consideration,a novel adaptive sliding-mode guidance law is presented for high-speed target interception.By adjusting the trajectory continuously,the interceptor is positioned ahead of the faster target to satisfy a specific geometry relation between the interceptor lead angle and the target flight direction relative to the line of sight(LoS).In this guidance law,the maneuvering dynamics of interceptor and target,and their model errors are considered.The boundary values of target acceleration and model errors are not required by use of adaptive sliding-mode design method.A realistic interceptor model is used in simulation and the results show that this guidance law can realize the head pursuit of high-speed targets and is feasibility.