Protection of buried steel casing pipe insulation buried pipe insulation corrosion resistant steel casing grades shall be determined by the local soil corrosion levels. When the soil buried insulating pipe corrosive soil is high grade, corrosion resistant grade should be considered special strengthen the level, when the soil corrosivity in class, the corrosion level should be considered to strengthen the level, when the soil level is low corrosivity , the corrosion level should consider the general level. So be sure to find out the design level of pipeline corrosion deposition section of the soil, in order to optimize the corrosion level. Cathodic protection of buried pipe insulation in metal corrosion processes are electrochemical protection method. With other buried insulating pipe corrosion process is different is that it is protected by the metal body to the applied current, thereby enabling the electrode potential shifted negatively protect the metal body, the metal lost by the atoms become ions state spontaneous attitude trend, thus inhibit corrosion is fundamental. However, this process must be carried out in an electrolyte, thus very suitable for buried pipes with cathodic protection. Cathodic protection of buried pipe insulation coating itself complement each other, there is a coating of cathodic protection can greatly reduce the current consumption, but can make up for lack of cathodic protection coating integrity aspects, so that security and economy to achieve the perfect combination, it is recognized as the best anti-corrosion program.