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A brief discussion on the use of anti-corrosive and waterproof mortar lining for surface water pipelines. All countries attach great importance to anti-corrosion measures both inside and outside buried steel pipes used for various purposes, as this has a direct impact on the service life of the pipes. When it comes to external anti-corrosion, factors such as the soil in contact with the outer wall of the pipe and stray currents are taken into consideration. Corrosion prevention measures mainly consist of various corrosion-resistant coatings or corrosion-resistant tapes. Corrosion prevention inside the pipe must employ different measures depending on the properties of the material being transported. The use of cement mortar or mortar lined with modified cement for the corrosion protection of water supply steel pipes has been recognized both domestically and internationally. It has many advantages: it offers good corrosion resistance, is non-toxic and pollution-free, has a long service life, which results in low maintenance costs and thus helps to save on water supply expenses. For example, the socket-welded steel pipes with a large diameter of DN2400 and a total length of 25 kilometers in Guangzhou have been rated as a high-quality, high-speed, and high-standard project for steel pipe linings. Furthermore, old pipes often suffer from scaling and leaks; during maintenance, the scaling is removed first to increase the diameter of the water pipe, after which a layer of modified cement mortar is applied to help repair the leaky areas in the pipe wall and reduce water loss. It is more time- and cost-effective than building from scratch, so why not do it? China’s steel pipe mortar lining technology has also been applied to water diversion projects in major cities across the country, achieving widely recognized results. Obviously, the quality of the lining mortar is of utmost importance. To ensure its quality and to prevent any decline in its properties due to variations in the specifications or quality of various raw materials during construction, the anti-corrosive and waterproof mortar used for lining these pipes is a light gray or dark gray powder made from ordinary Portland cement, carefully selected quartz sand, as well as various non-toxic active chemical substances, all of which are screened, ground, and mixed together. It must meet the requirements specified in the inspection certificate from the health and epidemic prevention station. ⑴ Features: Excellent corrosion and water resistance ； Simple to operate, long service life ； Non-toxic and harmless ； High strength, high wear resistance ； N on the surface of the lining after construction