In this paper, the vibration reduction by soilbags (“donow” in Japanese) is studied experimentally both in laboratory and in a field-testing pit. The experimental results indicate that the vibration produced on the vertically piled soilbags is significantly reduced and the vibration produced on one column of vertically piled soilbags is hardly transmitted into the adjacent column of the vertically piled soilbags even they are in contact each other. When soilbags are piled to construct a vertical barrier in the ground, they can reduce the vibration that is produced on the ground away from the barrier. The paper also introduces two cases of applying soilbags to reinforce truck roads with asphalt pavement and with concrete pavement, respectively. In both of these two cases, the traffic-induced vibration is significantly reduced after the reinforcement with soilbags.