The gas network can be abstracted as network model by social network analysis（SNA）.Taking the gas pipeline of the central city of Jinzhong as an example, this paper constructed the current network and planning network on Pajek. The network structure evaluation system was constructed including the topology structure, operation status and key facilities. Eight indexes including network density were calculated. The results show that the current gas network has a better operation while the planning has a better topology structure. The strategy for the network structure optimization and physical facility maintenance was proposed.