In order to study the effect of bolt profile parameters on the shear performance of bolt-grout interface, the two-dimensional confined direct shear tests were carried out. Analysis of experimental data found that rib spacing and height are the most important influential parameters for the peak shear strength, and there is a significant coupling effect between them. The influence of rib angle on peak shear strength is related to the normal stress and the rib width have little influence on it. There are some differences in energy of shear deformation under different normal stresses, energy of shear deformation is related with the height of rib under low normal stress, but there are no significant bolt profile parameters in the stepwise analysis under high normal stress. Besides, a quantitative classification criteria of the failure mode depend on the K and β are proposed and the critical rib spacing and rib angle of bolt under different normal stresses are obtained. Through the critical value the failure mode of interface can be judged. when the rib spacing is less than its critical value, the failure mode of interface is shear through failure. when the rib angle is less than its critical value, the failure is sliding failure. when the rib spacing and angle both greater than the critical value, the failure mode is dilation slip failure or sheared-crush failure. The research results provide a reference for the shape optimization of screw steel bolt and lay a foundation for further study the failure law of the bolt-mortar interface.