The Xiarihamu, Qinghai Province, is a superlarge nickel deposit discovered in the recent years. The deposit, geotectonically, is located in the uplifted area of East Kunlun Orogenic Belt. Genetically, it is related to small mafic—ultramafic intrusions, and belongs to deep liquating injected type of magma. The ore bearing intrusion is mainly composed of gabbro—norite, orthopyroxenite, olivine pyroxenite, plagioclase bearing lherzolite and orthopyroxene peridotite, while the orebodies are chiefly located in the orthopyroxenite and olivine pyroxenite in the form of lenses or stratoids. Massive, sideronitic and disseminated structure of sulfide ores are dominant in the orebodies, subordinately, taxitic and veinlet structure. The main ore minerals are pyrrhotite, pentlandite and chalcopyrite with minor and trace magnetite, chromite, pyrite, ilmenite, viorite, sphalerite, bismuthinite, bismuth, while the gangue minerals are orthopyroxene, olivine, augite, basic plagioclase, cummingtonite, anthophyllite, phlogopite, talc and serpentine. In this paper, the geological characteristics between Xiarihamu nickel depost and Jinchuan copper—nickel deposit (Gansu Province) are compared. This deposit has many unique characteristics. For instance, it has relatively young metallogenic epochs in comparision with the major sulfide Cu—Ni deposits in the world. The ores are characterized by low grade copper and depleted in PGE.