Under normal circumstances, when the fund is redeemed, it is sold first and then bought. The holding time of the fund varies with the buying time. In order to ensure the optimization of investors' redemption rate, most fund companies will redeem in accordance with the principle of first-in first-out. When funds bought at different times are redeemed and sold, the system will automatically give priority to the first part. In this way, when investors sell, the redemption rate is different according to the number of days they hold. Moreover, the longer the holding time, the lower the rate.

Investors have records of buying funds at different times. When redeeming, the system automatically sells in order according to the record of buying, that is, the funds bought first in order are sold first. In addition, buying funds and selling funds are calculated by share. When the fund is sold in batches, if the share sold at the same buying time is insufficient, the share near the buying time will be automatically sold, and the remaining fund share after selling cannot be lower than the minimum remaining share stipulated by the fund company.