Abstract: The formation energy and the liquid carrying ability were reduced during the middle or later times of natural gas exploration, which caused serious accumulation of liquid in the down hole and affected the productive capacity of well. Then, foam drainage measures are needed to maintain the normal production of gas well. Due to the existence of H₂S and CO₂, most of the gas field in Sichuan and Chongqing are of high acidity. Therefore, aiming at the gas field of high acidity which is in face of the problems of liquid loading, the study of corrosion inhibition and foaming compound agent could realize the application of corrosion inhibition and foam-dewatering gas recovery at the same time. In this paper, the corrosion inhibition and foaming compound agent named CT5-20 was studied, which was proved to be used under high temperature and high salinity (150 ℃, with salinity of 300 g/L). CT5-20 was used in the testing well of Chongqing gas field, it can be demonstrated that this compound agent can be used in the acid gas field with high salinity and high temperature for corrosion inhibition and foam-dewatering gas recovery.