Abstract: In order to prevent acid gas CO₂ from corroding downhole strings of Xujiahe gas well in west Sichuan, corrosion inhibitor is regularly added to the gas well according to experience. For the purpose of establishing a more rational inhibitor dosing system, inhibitor concentration in produced fluid requires to be measured. In this paper, ultraviolet spectrophotometry was adapted to eliminate interference on the basis of analyzing interference factors of gas well produced fluid and standard curve of inhibitor concentration in produced fluid was established. In the case that inhibitor mass concentration range is 0~100mg/L, there exists a good linear relationship between inhibitor mass concentration and absorbance. The determination of aqueous solution of corrosion inhibitor prepared for gas well produced water shows that measurement tolerance is less than 10%.