The decline in the net value of bond funds is due to the decline in investment targets. Bond funds mainly invest in bonds, and the rise and fall of the fund is determined by the investment target. If the bonds invested rise, the net value of the fund will rise, while the bonds invested fall, then the net value of the fund will fall.
Bond yield = bond price+bond interest. Generally speaking, the bond income is relatively stable and the risk is relatively small, which also makes the bond fund income relatively stable and the risk is relatively small.