Abstract: The use of construction waste is a new direction to build mountains and landscapes for modern cities.However the large area of the mountainous project and the largely load,a series of engineering geological problems are often generated.This problem is more prominent in soft soil areas.In order to make the mountain stacking work smoothly,the foundation must be processed to a certain extent,while the conventional calculation can only select the typical section or section for local analysis,and can not reflect the real three-dimensional influence characteristics,but numerical analysis can effectively solve this problem.In this paper,the finite difference software FLAC3D is used to analyze a certain mountainous project in Tianjin,which provides a strong basis for optimizing the ground treatment plan.