It has been long recognized that the roughness of rock discontinuities could have a significant impact on the shear strength characteristics of discontinuous rock masses. In order to study topography evolution of joint surface after shear tests, five samples were sheared two times and joint surfaces were scanned before and after each shear test with the 3D non-contact high-accuracy laser topography instrument (Talysurf CLI 2000). Topography evolution of joint surface is both macroscopically and microscopically analyzed, and the following conclusions are gotten: (1) the peak shear strength is related to the topography of joint surface; (2) after two shear tests, the number of peaks for the higher height of joint surface decreases, while that for the lower height of joint surface increases; (3) after two shear tests, the maximum height of joint surface decreases, the height of most asperities drops and the number of middle-height asperities rises; (4) after two shear tests, both of the envelope and the mean profile of joint surface tend to go down, and the descending height is related to the normal stress.