Renminbi kept by the People's Bank of China that has not yet entered the circulation field. The issuance fund is the national currency to be issued, controlled and managed by the People's Bank of China, issued according to the currency issuance plan, and entered the market through the business banks of commercial banks according to procedures and regulations. It is the reserve of RMB issued by the People's Bank of China, and it is an important means to regulate the market currency circulation.