Abstract: There are C02 gas wells in Jiangsu oilfield. In order to use the C02 to enhance oil recovery,matching technique such as transporting C02 through pipeline, liquefied C02 injection,C02 corrosion control,C02 backflow,etc.,was developed successfully. This technology was used in nearly 10 wells in the adjacent area, and better stimulation effect was achieved. The technology of huffing and puffing pipeline transported C02 in single well is a tertiary oil recovery technique suitable for improving the oil recovery of small complex fault block reservoir,it possesses higher popularization value in Jiangsu oilfield.