Slope excavation is a common technology to expand the land space for construction projects in the mountain area.Cutting of high slope with potential sliding surface will reduce the safety factor of the slope

resulting in landslide disaster and leading to loss of property and casualty.In this paper

the physical model test of high slope supported by micro pile group was carried out.The stress and deformation state of the micro pile group reinforced in the high and steep slope was studied.Experimental results show that the micro steel pile has perfect effect in high and steep slope supporting.For the unsupported slope

slope failure occurs after slope cutting

while for the micro pile group supported slope

the slope deformation is restrained.The factor of safety for the supported slope increases sharply and reaches to about 1.5.The distribution law of the force in the piles of the three rows is similar.The distribution of earth pressure in the antislide section shows a shape of inverted triangles.The thrust mainly concentrates in the soil about20 cm above the sliding surface.Earth pressure acting on the piles of the second row is significant because there is not enough soil arching effect formed between the piles of the first row.The ratio of earth pressure on the piles from the first row to the third row is about 1.3∶2∶1.The test results provide reference for reinforcement design of high slopes in the mountain area.