On which day of the week the fund is scheduled to buy, it needs to be considered comprehensively in combination with the types of funds that investors are scheduled to invest in and the funds that investors can use. For example, the fund invested by investors is a stock fund, and investors can consider buying it on Thursday. From the historical data, Thursday is a black Thursday, and the probability of stock falling is high, which means that investors may invest in the fund on Thursday, and its cost may be lower and its income may be higher.