Abstract: With the development of oilfield, the corrosion of gathering lines, due to the mid or high ratio of water cut in oil, will become more and more serious, which directly affects the safe production of oilfield. To solve the corrosion problem, a lining test has been made on the inner surface of corroded pipe section. The lining procedure, parameters control and lining process of cement mortar are introduced. It is considered that this lining method can elongate the service life of gathering lines.