The inter-bank bond market is the main place for commercial banks to conduct repurchase transactions, foreign exchange transactions and bond transactions. Through this market, commercial banks can enhance their financial strength, optimize their asset structure and increase their intermediary business income. For example, the face value of the bonds of the Postal Savings Bank is 105 yuan, while the bond issuance price of the Postal Savings Bank is105 yuan, which is called premium issuance.