Abstract: With respect to the problems in gas pipeline corrosion inhibitor pre-filming, such as more operations by experiences, poor universality of operation methods and parameters, large consumption of inhibitor and difficult control of film quality, main influencing factors and quality control methods for gas pipeline corrosion inhibitor pre-filming are discussed. Based on the main principle of corrosion inhibitor film forming, impacts of compatibility between pipeline media and corrosion inhibitor system, cleanliness of pipeline wall, flow pattern and the state of the flowing media, concentration of inhibitors, methods of filling, filling equipments, filling volume, pre-filming time, operating temperature, pressure and other factors in the pre-filming quality are analyzed to indicate the main control factors of inhibitor pre-filming.