Xi'an metro line 2 runs under the Bell Tower in Xi'an.In order to reduce the effect of the vibration on the Bell Tower caused by the long-term operation of the metro, a steel-spring floating slab track bed is adopted.Mainly based on the measured data,which monitors the influence of the Bell Tower's vibration under the operation of subway line 2,this paper compares and analyzes the measured values of vibration on the steel-spring floating slab track bed and usual track bed.The differences in the damping effect between the spring floating slab track bed and the usual track bed is worked out to evaluate the vibration-damping effect of the steel-spring floating slab track bed in the subway.