Abstract: In order to reduce the obvious railway dynamic response when the metro vehicles run at medium speed(120 and 140 km/h),the fasteners stiffness is reasonably designed,and the dynamic response and safety performance of vehicles and railways are checked.Resultsshow that the reasonable stiffness range is among 17-25 k N/mm.In this range,the vehicle derailment coefficient and overturning coefficient are both less than 0.8.Compared with those of common fasteners,when the frequency is among1-80 Hz,vertical vibration loss of slab with the vibration absorder is 8.7 d B,and vertical vibration loss of foundation is 5.7 d B.