The full length bonded prestressed anchor cable is the earliest and most widely used in China. In response to the viewpoint that the full length bonded anchor cable cannot be used as permanent support, the protection principle of the full length bonded anchor cable is discussed in detail, and a large number of facts are used to prove that the full length bonded anchor cable can be fully used as permanent support in non corrosive strata. Full length bonded anchor cables have the advantages of low cost, simple structure, fast construction speed, maximum mobilization of the self bearing capacity of the rock mass, greater bearing capacity compared to unbonded anchor cables, and no need for special protection of the external and external anchor heads during long-term use. They should be preferred in non corroded strata, but attention should be paid to following the usage conditions