1, from the historical trend of fund net value. When the trend of the fund's net value is in a downward trend for a long time, and the decline rate exceeds 50%, investors can buy moderately during the decline because the fund's upside is greater than the downside. On the contrary, the fund's net value has been on the rise for a long time, with a huge increase of more than 50%. Because the fund's rising space is less than the falling space, investors can wait and see during the rising process.

2. Judging from the performance of the fund. The strong will always be strong and the weak will always be weak, that is, when the fund performance is good, the fund manager's operational ability is strong and the fund's net value can continue to rise, investors can consider buying in the process of rising, while the fund performance is poor and the fund manager's operational ability is weak, which leads to the continuous decline of the fund's net value, so investors should not buy in the decline.

3. From the investment target of the fund. If the target of fund investment is in a bullish trend and has great development prospects and potential, investors can chase up, that is, buy in the process of rising. If the target of fund investment is in a short trend and its development potential is poor, investors should not buy it during the decline.