1. The principle of "first in, first out" in fund business means that when investors buy the same fund for many times, they will redeem it in the order of buying, that is, the first one to buy will redeem it first. 2. FIFO principle includes wealth management products. Fund redemption refers to the act of selling the fund shares held by the fund manager at a certain price and recovering cash during the existence of the fund. The remaining fund share after redemption cannot be lower than the minimum remaining share stipulated by the fund company (generally 1000); If it is lower than the minimum share, the fund manager has the right to redeem the balance of the fund share together. For the redemption business, the registrant's handling principle of share details is "first in, first out", that is, the share with the previous registration date is redeemed first.