Abstract: Steel spring floating slab track is a kind of track structure widely used in special vibration damping areas for metro engineering. In actual constructions, due to the influences of machine state, geological condition and operator level limit, large deviations often occur in the interval tunnels with shield construction, which leads to insufficient orbital height of steel spring floating slab track. This problem exists even after the slope adjustment. Therefore, it is necessary to change the structural size of steel spring floating slab track or the layout of vibration isolators, but at the same time, it also brings the change of vibration reduction performance of steel spring floating slab track. Based on a metro project in Hefei City, the finite element method is used to conduct a modal analysis of steel spring floating slab track structure in special structural dimensions and special vibration isolator arrangement schemes, so as to obtain the vibration characteristics of slab track under different working conditions.