Using the 5-minute K-line operation is an ultra-short operation, which requires fast-forward and fast-out. Doing this short-term is to make use of the intraday fluctuation of the stock price to earn the difference profit. After the opening, the bottom opening showed a long-term trend of box shock. When the K-line oscillates at the bottom, the bottom point of its fluctuation is always rising. This trend shows that there are funds actively operating in the market, and it is precisely because of the quiet opening of funds that the bottom point is slowly rising. Investors need to pay attention when the bottom point is rising. Once the late volume accelerates, investors can enter the market in time.