Conducted is field detection on gathering and transportation pipelines in Puguang Gas Field and it is found that obvious erosion corrosion occurs at many places in the pipelines, which results in pipeline wall thickness reduction. Established is a hydrodynamic numerical model for wet gas gathering and transportation pipelines to conduct gas-liquid two phase erosion risk prediction and evaluation research and the results show that shear stress in the pipeline gas-liquid interface is large and erosion is prone to occur in these areas. If fluid in inclined pipeline segment is slug flow, the shear stress in bottom area of the lower pipeline segment is large, flow corrosion risk is high and corrosion in such pipeline segment shall be closely monitored. The areas behind annular barriers of gas gathering pipelines in gas station, inlets of branch pipes, both sides of connecting pipes and middle and lower section of manifold main have high corrosion risk. These research results can provide valuable technical reference for corrosion monitor and control and safety management of gathering and transportation pipelines in Puguang Gas Field.