For the leakage of high pressure air cooler tubes caused by corrosion,the effect of hydrody-erosion-corrosion,standard k-ε turbulence model and SIMPLEC method are adopted.The numerical results are in good agreement with the inspection of tube.Furthermore,the flow characteristics in tubes of different namic erosion on process of corrosion is analyzed by CFD simulation that is used to simulate actual flow in high pressure air cooler tubes of one corporation.For finding the exact position that was badly damaged by transition structures is studied,which would provide helpful reference for the improvement of air cooler tubes.