Abstract: For the characteristics of high sour gas transportation, corrosion inhibitor pre-filming technology has been studied by using the nondestructive hydrogen flux monitoring in high sour gas-gathering line. The results show that the corrosion inhibitor pre-filming technology can effectively control corrosion in high sour gas-gathering line. The corrosion inhibitor is evenly distributed in all directions of the pipelines, and the effective protection period is 58 days.