The fixed investment of the fund is similar to long-term savings, which can spread the investment cost evenly and reduce the overall risk. It has the function of automatically increasing the price and reducing the price on dips. No matter how the market price changes, it can always get a relatively low average cost. Therefore, regular fixed investment can smooth the peaks and valleys of the fund's net value and eliminate market fluctuations. As long as the selected funds grow as a whole, investors will get relatively average returns without worrying about the timing of entering the market. It is not appropriate to choose bond funds for fixed investment. The biggest role of fixed investment is to spread risks. The risk of the bond fund itself is already very low, and it is meaningless to make a fixed investment. However, if the fund company has set up a bond fund to vote, investors can also handle it. As for the specific amount, it is best not to affect daily life.