Abstract: In order to alleviate the imbalance between the supply and demand of northern China for natural gas in winter, the information of gas infrastructures in Guangdong was sorted out based on the CNOOC's gas production, supply, storage and marketing system in Guangdong, as well as the current interconnection between the system and the Second West-East Gas Pipeline Network. Hydraulic simulation analysis on transient peak-shaving was conducted for the multi-source and multiuser pipeline network with the SPS software to provide a solution for the cooperative scheduling of the "south-to-north" gas transportation based on the surplus capacity of gas infrastructures in Guangdong, the gas sources and the pipeline network. Meanwhile, to facilitate the overcapacity release of the infrastructures such as the offshore gas and LNG receiving terminals of CNOOC, further to realize the stable "south-to-north" gas transportation, the interconnected gas pipeline network was optimized, and an optimization scheme of supplying gas to Shenzhen and Hong Kong by the existing Shenzhen gas pipeline instead of the Second West-East Gas Pipeline was proposed, which provides support for guarantee of safe gas supply in China.