The core use of the magic 9 turn index is to help us effectively escape the top area of the stock and accurately grasp the bottom opportunity of the stock. When the stock price rises 9 structure in the process of operation, the stock price is often located in the top reversal area, and individual stocks are likely to face the risk of reversal and decline. At this time, we should reduce the position to avoid the risk. When the stock price falls 9 structure, the stock price tends to be in the bottom reversal area, and individual stocks are likely to start the trend of stopping falling and rebounding. At this time, we can consider building positions or increasing positions to obtain the excess profits brought by the rise of stock prices.