Generally speaking, bond funds have low risks and relatively stable returns, which are more suitable for investors who want to obtain stable returns and participate in long-term investment mentality. However, in specific bond funds, there are different classifications. So, what is the classification basis of debt base? What types are there? First of all, there are three types of bond funds: standard, ordinary and specific strategy. Standard bond funds that only invest in fixed-income financial instruments and cannot invest in the stock market are usually called "pure debt funds". Ordinary bond funds are familiar to many investors, accounting for more than 90% of the total bond funds, which can be subdivided into two categories: those who can participate in the subscription and issuance of new shares in the primary market are called "primary debt bases"; Those who can participate in the primary market and buy and sell stocks in the secondary market are called "secondary debt base". Specific strategy bond funds, such as the Southern CSI 50 Bond Fund, belong to this category. Secondly, there are two kinds of bond funds: pure debt, primary debt and secondary debt. Pure debt only invests in the bond market, not the stock market. Such as Guangfa Pure Debt A(270048).

The first-class debt can invest in the first-class stock market and convertible bonds, and the maximum position does not exceed 20%, which means that new shares can be issued. However, the new regulations of the CSRC do not allow institutions to make new ones, so the first-class debt will become history in the future. Secondary bonds can invest in the secondary stock market, and the maximum position is no more than 20%, that is, they can buy and sell stocks directly. For example, E Fund Anxin Bond A( 1 10027). Finally, there are three kinds of bond funds: fixed lever closed graded debt base, fixed lever open graded debt base and variable lever semi-open graded debt base. Fixed lever closed graded debt base. The A:B share ratio of this kind of graded bond fund remains unchanged, and AB is listed and traded separately, and cannot be converted in pairs. Fixed lever open graded debt base. The A:B share ratio of this kind of graded bond funds remains unchanged, and AB is listed and traded separately, which can be converted in pairs. Variable lever semi-open graded debt base. The A share of this graded bond fund is not listed and traded, and it is regularly open for subscription and redemption, with a net value of 1. When B shares of graded bond funds are listed and traded, the proportion of A:B shares changes according to the purchase and redemption of A shares on the open day.