To discuss the applicability of willow cuttings in slope ecological slope protection method，the paper systematically introduces construction process technology of this method，and analyzes the mechanical model of the anchor root system of willow cuttings.Meanwhile discrete element simulation is used to simulate the angle change of cuttage，showing that the greater of cuttage angle，the smaller the anchoring and supporting effect of the slope.It is of practical significance to find out the most suitable cutting angle for willow cutting.