Abstract: The feedback linearization method is utilized to generate guidance laws to track desired height and velocity profiles respectively for lunar gravity-turn descent.The Lyapunov stability of the two following control systems is demonstrated in use of related theory of differential geometry.Furthermore,an attainable set for initial conditions of the gravity-turn descent is deduced according to the constraints of thrust,fuel and states of the soft landing system.Finally,an example of the following guidance law is presented,which needs only slant range,velocity and local vertical information.This method may allow simple guidance with less complex sensors for low-cost soft landing on the lunar surface.