Abstract: As a part of gas transmission pipeline project, the city gas distribution pipeline network is a very important component for the new gas to enter into the city. Before gas moves in, it is necessary to analyze the availability of the old pipeline network and to consider reconstructing new one whether or not. In this paper, take Lanzhou gas transmission pipeline network as an example, by means of analyzing the pipeline's design, construction and corrosion control of gas distribution system, some suggestions on detecting the soil resistivity and corrosivity along the pipeline distribution network and external coating of pipe have been put forward.