Abstract: Bamboo-steel composite anchor(BSC composite anchor) is a newly designed anchor for stabilization of soil strata encountered in earthen historical site.From the perspective of composite mechanics of bamboo composite bolt mechanism of the work of internal systems,we put forward the internal system of bolt shear stress layer transfer model.Composite anchor mechanism of the work show that pipe-elastic modulus and the elastic modulus influence the material value of the shear modulus of the binder such as bamboo composite bolt greater impact on the internal load transfer.We found that the internal layer of stress transfer curve can be achieved to optimal state using the following measures: changing the pipe with wood-modulus of elasticity ratio,etc.