Monetary fund is an open-end fund that collects idle social funds, is operated by fund managers and kept by fund custodians. It specializes in investing in low-risk money market instruments, which is different from other types of open-end funds. It has the characteristics of high security, high liquidity, stable income and "quasi-savings".

In order to reflect the characteristics of cash assets, money market funds usually maintain the net share value at 1 yuan according to the balance of bank deposits, and reflect the income in the form of dividend reinvestment share increase. The income is calculated every day, and there is interest income every day, and investors enjoy compound interest.