Operation of BeijingTianjin intercity railway indicates that the “highspeed era” of Chinas railroad started. However, with the increase of the train speed the environmental vibration control along the railways has been becoming a serious problem. Therefore, the project on the groundborne vibration due to railway traffic is becoming a special concern in civil and environmental engineering. In this paper, the numerical model is set up, which consists of the vehicletrackroadbedground coupling system and the groundbarrierbuilding coupling system. The universal finiteelement software ANSYS is used to analyze the reduction effect of vibration isolation of a new style trench. The style includes trapezoid, upsidedown trapezoid, triangle, upsidedown triangle and so on. The vibration isolation effect of the new style trench is compared with that of the traditional trench. It is shown that the effect of the new style trench is better than that of the traditional trench, and the style of the trench can be properly changed to improve the effect of vibration isolation.