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Nickel is a hard, ductile and ferromagnetic metal with high polishing and corrosion resistance. Nickel belongs to the iron-loving element. The inner core is mainly composed of iron and nickel. In the crust, ferromagnesian rocks contain more nickel than silicoaluminous rocks, for example, the nickel content of peridotite is 1000 times that of granite, and that of gabbro is 80 times that of granite. 20 17, 17,1October 27th, the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization was preliminarily sorted out for reference. Nickel compounds are included in the list of carcinogens, and metallic cobalt, metallic nickel and alloy powder containing 66-67% nickel, 13- 16% chromium and 7% iron are implanted into foreign bodies.