Abstract: A method named CASE method is presented for determining the statically axial bearing capacity of piles from dynamic measurements of force and acceleration performed under the impact of a large hammer. The basic equation for calculating resistance against pile penetration is derived. The examples of field measurements are given. In order to use CASE method effectively, it is necessary to determine “damping ”constant by comparison the pile bearing capacity from static method with that from CASE method, or by changing hammer weight or dropping height to cause the Vb to close on zero and to obtain the static bearing capacity of pile.