Abstract: In order to evaluate the vibration reduction effect of the high performance vibration reduction slab in actual situations, researches on dynamic responses of a new combined slab track system were made through the finite element simulation and onsite tests on Zhengzhou Metro Line 2. The results suggest that compared with general monolithic slab system, the combined slab track system has a lower vibration frequency, but their pinned-pinned vibration frequencies keep consistent; as for the intermediate vibration from the track bed, the maximum vertical vibration of the combined slab track system can be reduced by 16.8 dB and maximum transverse vibration can be reduced by 9.6 dB.