1. Look at the trend of the fund investment object: when the fund investment object is at a historical low, the fund is also at a low level.

2. Judging from the trend of the fund's net value: When the fund's net value is at a historical low, investors can judge that it is currently at a low level.

3. Look at the fund's income curve: if the income curve is at a high level in the last year or the last six months, it means that the current price is higher than the high price.