Abstract: During the design, construction and operation of floating slab track structure, dynamic parameters need to be studied through tests. By conducting impact test and cyclic loading test to steel spring floating slab track structure, the dynamic parameters such as the natural frequency, stiffness and damping ratio of the floating slab under different test methods are obtained respectively, and the applicability of different test methods is analyzed. The results show that the low-frequency dynamic stiffness of cyclic loading is consistent with the static stiffness of progressive loading; the impact load of both hammering impact and dropping wheelset can accurately measure the natural frequency of the floating slab track structure. Both the impact and cyclic loading can measure the damping ratio of the floating slab. Compared to cyclic test, hammering impact operation is more convenient, but its damping ratio is more affected by the number of waveform peak intervals. It is suggested to take test results in 3 to 4 near periods, in which condition the damping ratio of impact test is consistent with that of cyclic loading.