Abstract: Weight-loss method, electrochemical methods, scanning electron microscopy and atomic force microscopy were used to study the corrosion inhibition performance of N-(2-octyl-2 imidazoline) triethylenetetramine amide for carbon steel in HCl/NH4Cl-H2O and H2S/NH4HS-H2O solution at 50 ℃. The results showed that the inhibition rate was close to 90% when 15 mg·L-1 corrosion inhibiter was added. The corrosion inhibitor is an anodic type corrosion inhibitor. After adding the inhibitor, long passivation range for the steel was formed, AC impedance radius became bigger, corrosion current decreased obviously. Microscopy result demonstrated that N-(2-octyl-2 imidazoline) triethylenetetramine amide could form a compact film on the surface of the carbon steel specimen to protect it from corrosion.