1. Determine the type of support line. There are many types of support lines to choose from in the trading software of Guotai Junan Securities, such as simple moving average, exponential moving average, weighted moving average and Fibonacci retracement line.

2. Select a time period. The time period of the support line refers to the set length of time, which can also be understood as the number of trading days involved in data calculation.

3. Adjust the support line according to market conditions. The market situation is constantly changing, and it is necessary to constantly adjust the setting of the support line to adapt to different market trends.