The calculation of the pulling force of the bonded inner anchor head is a key problem in the engineering design of ground anchor. This paper makes a comprehensive analysis of the existing design calculation methods, and uses the calculation model and calculation program proposed in literature [7] to consider the common deformation of bolt, slurry and surrounding rock, and discusses the value of tangential stiffness coefficient of slurry and the influence of deformation modulus of rock and soil mass on the internal force distribution of anchorage section in the design of ground anchor.