Bond funds may not be able to buy and sell at any time. The most important thing is to see how the fund contract is stipulated. Part of the Class A share of the leveraged graded bond fund is the agreed income of fixed income once every six months, which is open for subscription and redemption once every six months and is not listed and traded; There are also some leveraged graded bond funds whose Class A shares are closed for a certain period of time. During the closed period, it can be listed and traded, but it cannot be purchased and redeemed. Class B funds of leveraged graded bond funds are listed and traded, and some bond funds can be redeemed and traded through fund subscription, so can general open-end bond funds.