Hongtoushan copper deposit is a typical high metamorphosed one of the massive sulphide type. It occurs in the biotitehornblende-plagioclase-gneiss of anshan group of archaean era. The study shows that the ore has undergone a regional metamorphism of hornblendite facies as well as its wall rock. The main metamorphic fabrics are as follows, 1，Deformations 2 .Annealings 3 .Partial refusion and 4. change in mineral phases. Deformatiom fabrics include metamorphic rounding texture of quartz, frac- Lure in ore and minerals, plastic filling, pressure twins and undulatory extinc- tion. The metamorphic rounding texture of quartz is a characteristic fabric of the massive sulphide ore under a regional metamorphic condition. Annealing brought about a readjust of the surface tension of grains and the tending of equilibrium. When fully annealed, a single-phase ggregation may develop a foam texture with triple junction angle close to 120‘and a Lwo-phase aggregation may form characteristic dihedral angles, the size of which depends upon the interfacial free energy ratio. An important sign of metamorphism is the poikiloblastic texture of one another between minerals. The grain size of sulphide, especially of pyrite can indicate the degree of metamorphism. There are some evidences that a partial refusion took place at the peak of metamorphism. around the coarse sphalerite there are fine myrmekitic inter- growth of sphalerite, chalcopyrite and pyrrhotite. The rising of temperature, the change in oxygen and sulphur fugacities resulted in the change of mineral phases. That is the phase change between pyrite, pyrrhotite, magnetite etc. The thin rim of uralite and chlorite situated between sulphides and quartz (or feldspars) is伍。products of solid reaction, but not of hydrothermal process.