his text will take the typical slope with hard continuous structure as example, adopt the finite element strength reduction method and the geotechnical numerical analysis software to create the numerical models in order to solve the safety factor and find the slip plane of the model in different structure surface positions, slope angles, structure inclinations.So it is viable to reflect the general characteristics and make modeling.The results show that the safety factor improve gradually with the increases of the distance between the structure plane and the slope foot；when the slope angle becomes large, the shear stress is concentrated to the foot of the slope, then the damage appear；when the slope angle is a certain value, the safety factor with the inclination angle is a U—shaped parabola; the potential slip plane maybe occurs along the structural plane, maybe in the rock slide.The regular understanding of the above geotechnical parameters has effect on the slope stability, which can be used for instructing the project, and there is certain value to popularize.