Abstract: The author suggested the Theory on Structure-Controlled Rockmass as a fundamental theory of rockmass mechanics in 1984 after a lot of practical and rescarch works in a long time and comprehensively, schematically investigated the basic law of defomation, failure and mechanical properties of rockmass, guided by the Theory on Stucture-Controlled Rockmass. The author suggested a series of viewpoints, that is, the rockmass deformation was contributed by the deformation of rockmass material and the deformation of rockmass structure. The rockmass failure was controlled by the rockmass material and rockmass structure. The mechanical properties of rockmass have been determined not only by the mechanical properties of rockmass material, but also by the mechanical effect of rockmass structure and mechanical effect of environmental factors (earth stress, underground water, earth temperature). On this basis, the author suggested that, the rockmass may be classified into four types of mechanical medium, that is continuous medium, jointed medium, blocky medium and slabbed medium, and that, the rockmass mechanics is a mechanical system, consisting of continuous medium, jointed medium, blocky medium and slabbed medium. Thereby, an integreted theory system of Rockmass Structure Mechanics was systematized by the author.