In order to make full use of the advantages of microwave landing system (MLS) on widerange landing guidancean MLS lateral autolanding control law with automatic path definition was designedwhich could generate an approaching trajectory according to the aircrafts initial position and attitude and control the aircraft towards the runway centerline.Three approaching modes were proposed:single circularS shape and direct centerline approaching.The control laws for the three approaching modes were designed.Simulation shows that the control laws can guide the aircraft towards the centerline of runway under different initial conditions.