The bond performance for mortar-bolt interface significantly affects the reliability of anchoring system, which is a fundamental factor for geotechnical engineering. The bond-slip behaviour can be obtained by conventional pull-out testing in a mortar cylinder containing a bolt. It is almost impossible to observe the local bond-slip behaviour by this conventional approach which is also inconvenient to apply the confining loads. We develops a direct shear method for testing the bond-slip behaviour for mortar-bolt interface.The realistic ribbed bolt is scanned by three-dimensional laser scanning then the ribs are unwrapped. The ribs are carved on a steel block surface for representing the ribbed bolt. Further, mortar specimens are poured on the reconstructed steel blocks with ribs. Direct shear tests are carried out to investigate the bond-slip behaviour for mortar-block interfaces. The Digital Image Correlation method is also employed to monitor the strain field during the shear loading. Bond-slip curves and bond parameters are easily obtained and the effect of normal stress are discussed. Finally, a coupled finite element-particles model, in which mortar is modelled as bonded particles and steel is modelled as finite elements, is developed to investigate the bond-slip behaviour. The developed method provides an alternative and easy tool to investigate the bond-slip behaviour for mortar-bolt interface under confining pressures, which can also be applied in reinforced concrete structures.