Abstract: A new concept,compound damp drip for absorbing shock wave in oscillatory tube,is developed in the present paper.The main idea of the concept is that the shock wave absorber must has the two functions,that is,it can not only exhaust the energy of the incident shock wave fully but also transfer the energy out promptly.In the experiment,the compound damp drip is structured with a multi-orifice for intensifying the energy dissipation of the shock wave and an internal cooling system for strengthening the heat transfer.The experimental results show that a strong reflect shock wave,whose strength is 66%of the incident shock wave ,is measured at the position of the relative tube length x/L =0.3 when the oscillatory tube without the compound damp drip.But,after the compound damp drip is amounted at the closed end of the tube,the reflect shock wave is eliminated effectively and the refrigerating efficiency η is increased by 4%～10% in case of the L/d ratio is 140 and the expansion ratio ε is changed from 2.0 to 6.0.What is more ,the refrigerating efficiency in case of L/d =140 and the tube is mounted with the compound damp drip is still higher by 2%～6% than that the tube without damp drip but L/d =300.The above result means that while the damp drip is used,the refrigerating efficiency can be increased and the size of the refrigerator can be decreased significantly.