Recently the radiation therapy device that is tracking pulmonary tumors according to respiratory cycle is developed to minimize the dose to normal tissues such as 4D-CT and IMRT (Intensity modulated radio therapy). Accordingly, 4-Dimensional Phantom mimicked the human lung should be developed in order to measurement the accuracy of new radiation therapy device. Existing 4d-phantom is limited to represent patents lung motion and used metal materials. So Metal Artifact that debase CT image resolution exist. To improve Existing 4d-phantom, this study suggest the Hydraulic Lung Phantom that the volume change is large and the deformation is dynamical using abaqus simulation.