Abstract: Gas loss is one of the special parameters of gas stora- ges,which not only is related in the economic features of gas storage operation,but also is the key to evaluate whether or not gas storage is successful.It analyzes the functions,the good and bad points,the site conditions and the main reasons of loses of the underground natural gas storage of aquifer.Based on the theoretical analysis, the gas content loss of underground natural gas storage which is caused by water soluble gas cannot be neglected through the example analysis.Then it proposes the solu- tion measures.