Abstract: In order to reflect the actual contact state in slope reinforced anti-slide piles,created the interface elements between bedrock and its upper soil and anti-slide piles and its surrounding soil,minutely analyzed the slope stability before and after reinforcement and the stress mechanism of anti-slide piles during excavation.Revealed the axial and shear stress of the anti-slide piles are larger at interface between bedrock and soil,the section of anti-slide piles at interface is its dangerous one.Stress adjustment time of anti-slide piles at interface lag that of pile top and pile bottom,the piles at interface suffered greater disturbance during stress adjustment of slope.The maximum stress of anti-slide pile at interface is not its stress of slope steady state,but appears in the stress adjustment process of slope.