Abstract: Through the technical and economic evaluation on dendritic pipeline network and looped pipeline network of urban gas distribution system, it is considered that the dendritic pipeline network is more economic than the looped pipeline network. A gas distribution program, combined with the two networks together, is put forward, that is, the mainline or high/medium pressure pipeline is designed to looped pipeline network, the branch pipeline is designed to dendritic network. With this program, hydraulic reliability of gas distribution pipeline network can be ensured. Meantime, supply of gas is stable and the investment on pipe material can be saved.