Abstract: For the problem that the larger shear generated when anchor system ends of glass fiber reinforced plastic bolt were under eccentric load and resulted in bolt fracturing and "cut" and made the anchoring system completely lose support ability, using ANSYS finite element software, we carried out simulation analysis on anchor bolt under eccentric load. Additional bending moment caused by bolt's tail is the main reason for the fracture when bolt tail is under eccentric load; shear stress of bolt's tail is the largest at the contact site of rock and bolt's tail, so, the anchor bolt is most vulnerable to shear failure in this part. On the basis of the above, the feasibility of thick tail bolt to solve the eccentric load is proposed.