<p>A peak shear strength model of rock joints with different joint wall materials is proposed in this study. First, coupling rock joints with the same surface morphology and different materials of upper and lower joint walls are made. The shear tests of these coupling rock joints under different normal stresses are carried out. The test results show that the joint wall strength affects the shear deformation and strength of the coupling rock joints. The peak shear strength increases with the joint wall strength coefficient; the wear degree of the upper and lower joint wall decreases with the joint wall strength coefficient. The limitations of the existing strength equation for rock joints with different joint wall strengths are analyzed. When the joint wall strength parameter is taken as the strength of the soft joint wall or the hard joint wall, the estimated value is generally smaller or larger than the test value. The equivalent joint wall strength is affected by the joint wall strength coefficient, and the contribution of the soft joint wall to the equivalent joint wall strength is greater than that of the hard joint wall. Based on the wall strength of the soft joint wall, a modified model considering the joint wall strength coefficient is established to determine the equivalent joint wall strength with different joint wall materials. Furthermore, a peak shear strength model considering the actual three-dimensional roughness and suitable for rock joints with different joint wall material types is proposed. The model is verified to be effective by further experiments.</p>