Cement mortar lining has several obvious advantages: 1. Avoid pipe wall corrosion rust generation, so long pipeline to maintain good water status, the friction coefficient. 2. Because the lining of the coating isolated, water is not in contact with metal pipes, to ensure that the water quality. 3. Pipe wall by a cement mortar corrosion, preventing corrosion perforation, extending the life of the pipeline, 4. Cement mortar coating materials easily obtained, short construction period, good corrosion protection, reduce the cost of the pipeline project. In view of the above advantages of cement mortar, for corrosion functionality and economy, is increasingly recognized by domestic and foreign engineering department, domestic cities are promoting the use of cement mortar as a metal water pipe corrosion is mainly affected by point. National also has formulated norms and quality standards cement mortar lining. That CECS10: 89. Construction of cement mortar in two ways. First floor centrifugation. Mainly in pipes lined with suitable construction DN400 caliber or less. But ground spraying, mainly applied to more than DN700 diameter underground pipeline corrosion construction. Cement mortar lined with metal pipes were two kinds of material, mortar binding force how the pipeline? In particular, whether the inner pipe coating will fall off in the transportation, installation and other external force? That is how the mechanical strength? According to foreign experimental data to prove its mechanical strength. Pipe in flattening deformation under external pressure, the mortar will have a "hairy" crack, but peeling mortar from the wall is very difficult, in the DN800 mm diameter steel pipe wall thickness of 7.1 mm, the interception of a meter long The pipe section is coated lining 11 mm mortar coating thickness, 7-8 mm when flat amount, you can see a "hairy" cracks. When the flat amount to 50 mm, the crack gradually increased to edge the whole pipe sections, the experimental results have a "hairy" crack pipe diameter 1% of the amount of the flat, when flat amount of 6-9% of cases, mortar coating peeling crack at the beginning, to the diameter of 30%. This construction is never allowed to happen. It is measured on the DN1100 pipes, the minimum flat amount of 15 mm, 21 mm on the DN1800 pipe. Thus, the diameter increases, resulting in a flat also increased the amount of crack