In 2022, the Fourth Geological and Mineral Exploration Institute of the Gansu Provincial Geological and Mineral Exploration and Development Bureau discovered for the first time a medium- sized magma melting type nickel deposit —— Hongchuan copper—nickel deposit in the western section of the North Qilian Orogenic Belt. Since its discovery, the deposit has mainly carried out mineral exploration work, and various research works are relatively weak. There are few reports on the research of ore bearing ultrabasic rocks, for the first time, authors conducted a supplementary analysis of the petrographic and geochemical characteristics of the No. III ultrabasic rock system in the Hongchuan copper nickel depsoit, and explored the deep structural background and ore bearing potential of the ore bearing ultrabasic rock.