Abstract: To mastering the corrosion status of surface transport pipeline in Changqing gas field, anticorrosion coating of 12 pipelines were inspected by pipeline current map (PCM) and excavation in recent years. It was found that the proportion of coating appearance in good condition account for 90.4%, the proportions of coating appearance with little damage and seriously damaged account for 5.2% and 4.4% respectively. On this basis, the main reasons of unqualified anticorrosion layer were analyzed. The proposals of anticorrosion design were put forward in the future gas field, including optimal selection of anticorrosion materials, strict implementation of the technical requirements of anticorrosion coating construction, strengthen construction management of party B, to ensure the anticorrosion effectiveness of pipeline.