the net value is 121 yuan. Interbank certificates of deposit can earn 121 yuan in 7 days. Interbank deposit certificates are book-entry time deposit certificates issued by deposit-taking financial institutions in the national interbank market, and their investment and trading entities are members of the national interbank lending market, fund management companies and fund products. Interbank certificates of deposit are short-,medium-and long-term interest rate curves that appear as substitutes for interbank deposits and improve the quotation in the interbank lending market. In August, 213, the central bank has considered trying to issue interbank certificates of deposit in the inter-bank market, and taking the opportunity to launch relevant policies, so as to set off a prelude to the market-oriented reform of deposit interest rates.