Abstract: The numerical simulation of the foundation excavation and support on Lushan open-cut metro station of Chengdu metro line 1 was carried out using the software FLAC3D, and the deformation law during the process of foundation construction was obtained. In the course of simulation, a three-dimension model was built and seepage and consolidation was considered to restore the true situation vividly. This simulation offers the settlements of ground surface, uplifts on the bottom of the foundation pit, lateral displacement of soil and horizontal displacement of cast-in-place piles, providing reference for the design and construction of similar engineering.