An arbitrary time guidance law is proposed for the interception of maneuvering targets with impact angle constraints.The design of the guidance law adopts the arbitrary time stability theory and the piece-wise sliding mode method,which solves the problem that it is difficult to obtain the convergence time of the finite-time and fixed-time guidance laws,and realizes the arbitrary setting of the convergence time of the line-of-sight angle.The designed guidance law is analyzed and proved by using the relevant stability theory.The effectiveness of the arbitrary time guidance law is verified by numerical simulationand the simulation results are compared with those of the finite-time and fixed-time guidance laws.