The financing party refers to giving up the national debt mortgage bonds within a certain period of time, obtaining the right to use the corresponding amount of funds within the same period of time, returning the borrowed funds by repurchasing the national debt mortgage after the expiration, and paying interest according to the market interest rate at the time of transaction. Make a "buy" statement when trading. A securities lender means to give up the right to use funds for a certain period of time and obtain the amount of national debt mortgage for the corresponding period. After the maturity, the loan funds are recovered by selling the national debt mortgage, and the interest income is obtained according to the market interest rate at the time of the transaction. Make a "sell" statement when trading.