For the same fund, A front-end only charges once, and C front-end does not charge. The difference between bonds E and C lies in the different charging methods: Bond E has no subscription fee, but it will charge a sales fee; Bond c has a subscription fee. If investors don't know how to charge the fund, they can know the similarities and differences by comparing the E and C categories of the same fund. For example, comparing China Merchants Double Debt E and China Merchants Double Debt C, the charging methods are different, and other funds can also compare in this way. Because E-type funds need to accrue sales expenses, the net value of E-type bond funds is generally not as high as that of C-type funds; Although Class C funds charge subscription fees, they are not included in the sales expenses in the later period, and the daily net value of the funds belongs to investors' income. Whether it is bond E or bond C, fund managers generally operate in combination, so there is only a difference in cost. In the long run, it is more cost-effective to invest in bond C, while it is more cost-effective to hold bond E in the short term. Investors can choose fund investment according to their personal preferences.