Abstract: As the biggest road-railway tunnel so far in China, the immersed tunnel at the south extension of Fenjiang Road, Fo'shan City was designed with asymmetrical cross section to meet the demand of travel.This differs it from most of immersed tunnels and brings big challenge to design and construction.This research studied the pipelines of immersed tunnel under static loading based on 3-dimensional numerical stimulation analysis.Some conclusions are reached by comparing the stress states of symmetry-sectional tunnels and asymmetry-sectional tunnels, under different stress, deformation and settlement conditions(Asymmetric tunnel section on lateral produced the asymmetry settlement, etc).This research provides valuable reference for subsequent construction and similar projects.