Without influencing the damping effect of floating slab track， the usage amount of the steel spring is decreased to reduce the construction cost of floating slab track.The finite element model of steel spring is constructed according to the practical engineering construc-tion drawings， and the modal frequency and vertical displacement of steel spring floating slab track under different spring stiffness， arrangement mode and loads are analyzed.Simul-taneously， an actual operation subway track in the city of southern China is chosen as the optimization target， the number of steel spring used， arrangement and parameters of steel spring is calculated， and the optimization results are verified by numerical simulation.The result indicates that the usage number of steel springs for a25m floating slab track can be reduced to 32， and the steel spring stiffness is 8.5kN/mm， the natural frequency of the whole system is less than 10Hz， which can obtained better shock absorption effect.