At present, it supplies PVC Foam was used in everyday life? Because the material is lighter and stiffer by the assembly. A sandwich structure of the floor as the floor of the cargo ship, train, airplane wings, wind, etc., because these are the parts is very important. If there is no expansion or cracks in the sandwich structure. Will result in damage to the lives and property of our authors have seen the importance of this issue. Therefore, PVC Foam material to study and test creep crack growth in structural sandwich.