Buy hedging, also known as long hedging, refers to the operation of hedgers to hedge the price rise risk of their spot goods or assets or the goods or assets they will buy in the future by establishing long positions in the futures market. The application of purchasing hedging mainly includes: ① planning to buy bonds, fearing that falling interest rates will lead to rising bond prices; (2) borrowers who pay interest at fixed interest rate are worried that the interest rate will drop, which will lead to a relative increase in the cost of capital; (3) Lenders of funds are worried that the interest rate will drop, which will lead to the decline of loan interest rate and income.