Abstract: The significance, position, and role of rockmass structural mechanics are disdussed from the aspect of rockmass engineering-geological mechanics. Theoretical characteristics of rockmass strucural mechanics are summerized into five aspects, i.e., redeformation and refracture, controling effect of rockmass structure, cybernetics of rockmass structure, its uccurrence environment and mechanical system of multiple mechanical media and construction of mechanical model.