1. According to the trend chart of fund net value, find the recent low point and high point as the support position and pressure position respectively. When the fund net value falls below the support level, the fund net value may start a downward mode and hit a new low; If it is supported by the support level below, it will rebound; When the fund's net value trend is suppressed by the upper pressure level, its trend may reverse downward. On the other hand, if it breaks through the upper pressure level, it may continue to run upwards and hit a new high. 2. Compare the trend changes of fund return rate, Shanghai Stock Exchange Index and Shanghai and Shenzhen 300 Index in the cumulative return rate trend, and predict the future return rate of the fund. When the fund's rate of return runs above the rates of return of Shanghai Composite Index and Shanghai-Shenzhen 300 Index, it means that the fund is stronger than Shanghai Composite Index and Shanghai-Shenzhen 300 Index, and vice versa.