Because nickel and stainless steel belong to metal futures. Stainless steel production is the main consumption mode of nickel, and nickel is also one of the main costs of stainless steel production. The fluctuation of nickel price will directly affect the rise and fall of stainless steel price. The relationship between the two is not one-way, but two-way. Nickel price can affect the rise and fall of stainless steel price. Similarly, the strength of stainless steel demand will also lead to the increase or decrease of nickel consumption, and the increase of stainless steel demand will lead to the increase of output, which will lead to the increase of nickel price. The increase of nickel price will also lead to the increase of stainless steel production cost, thus affecting the production and supply of stainless steel.