The public offering of funds can be divided into two parts. Public Offering of Fund is divided into front-end business units and back-end business units. Front-end share refers to the settlement share when subscribing and purchasing funds, which is generally extracted according to a certain proportion of investment. Back-end share refers to subscription and subscription without any settlement fees, but it is withdrawn at redemption. Fees are generally a certain proportion of subscription and subscription amount, and decrease year by year according to the increase of the number of years of holding funds.