Abstract:The bamboo-steel composite anchor is a kind of new anchor that is designed for aiming at the bulk earthen sites. According to the test,the reinforcement of earthen sites accords with the principle of the heritage sites protection by adopting the PS series of grout material and the bamboo-steel composite anchor. If adopting the cement mortar as grout material,its anchoring unit power can be adopted 30 kN/m;if adopting the PS-(F+C) as grout material,its anchoring unit power can be adopted 20 kN/m. When reinforcing the earthen sites by the bamboo-steel composite anchor,its weak interface exists between anchor body and anchoring solid. The strengths of cement-mortar and PS-F slurry are adopted for anchoring by the bamboo-steel composite anchor. The standard value of cohesive strength averages 187 kPa,the eigenvalue averages 85 kPa between the cement-mortar and anchor body. The standard value of cohesive strength averages 114 kPa,the eigenvalue averages 52 kPa between the 12% PS-F and anchor body.