The Katebaasu gold deposit is one of the superlarge gold deposits recently discovered in the Nalati-Hongliuhe gold-copper-nickel-lead and zinc-jade-muscovite ore-forming belt. Based on field geological survey and indoor integrated study, the authors investigated the modes of occurrence of gold in the gold ore by such means as microscope identification, scanning electron microscopy and X-ray energy spectrum analysis. The results show that gold minerals in the Katebaasu gold deposit mainly occur as native gold and silver-bearing native gold, with the fineness of the native gold being 764.5‰~1 000‰. The main gold-carrying mineral is pyrite, with a small amount of chalcopyrite and gangue minerals. The main gold mosaic forms include crack gold, intercrystalline gold and minor enclave gold. In the ore, native gold exclusively exhibits microscopic grained gold with the grain size less than 40 μm.