Abstract: Internal corrosion of gas pipeline intends to increase due to the high contents of H2S and H2O in the gas transported. In recent years, several leakages due to corrosion pits or sulfide stress cracking were found, which interrupted normal transmission. Hence, GP-1 corrosion inhibitor is developed to control local corrosion and increase comprehensive performances. The inhibitor is composed of amide compound and other components. Experimental evaluations (weight-loss method and electrochemical method)as well as field simulation tests show that, at a ppm of 100×10^-6, GP-1 has a inhibiting rate of 97.7%, a considerable resistance to pit corrosion and high comprehensive performance. Therefore it is suitable for application in gas gathering line for the control of internal sulfide corrosion.