Abstract: Vibration source intensity of four operating lines in Xi′an rail transit is measured systematically. The attenuation characteristics of vibration from rail to tunnel wall and the attenuation pattern of train vibration are analyzed. The impact of line curve radius and track bed type on vibration reduction effect is discussed. Research results show that,in terms of damping effect, large curvature radius line is better than small curvature radius line, damping pad floating slab track bed better than short sleeper monolithic track bed, and steel spring floating slab track bed better than ballast bed under the same conditions.