Freedom of the entire root anchor bolt into segments and anchor bolt segments must have several factors: ① a tensile strength higher than the rock mass rod ② rod end should be in close contact with the formation and geotechnical friction (or bonding ) resistance ③ rod is located outside the other end of the rock mass can be formed on the rock and soil anchor drag radial depth strata as tension members, it is connected to one end and engineering structures, and the other end into the formation, the entire root anchor points segment and anchoring segments for freedom, free section refers to the bolt head at the rally spread to the anchorage area, and its function is to anchor prestressing; anchoring section refers to the cement paste and the soil will be bonded prestressing tendons area, its function is to anchor the soil body and increases the adhesion friction, increasing pressure effect anchoring body, the free section of the force transmitted to the depths of the soil. According to the definition given in the basic structure of the anchor. Bolt must have composed several factors: ① a tensile strength higher than the rock mass rod ② rod end should be in close contact with the formation and geotechnical friction (or bonding) resistance ③ rod is located outside the other end of the rock mass can the formation of rock and soil anchor drag radial depth strata as tension members, it is connected to one end and engineering structures, and the other end into the formation, the entire root section and the anchor bolt into free section, free section refers to the anchor anchoring force transmitted to the head office of the regional body, its function is to anchor prestressing; anchoring section refers to the cement paste and the soil will be bonded tendon area, its function is to anchor body and soil adhesive friction increases, the pressure to increase the role of the anchor body, the free section of the rally spread soil depths