In the face of losses during trading, we should not hesitate to reduce positions or set stop losses. When achieving book profits, we can be more patient and give profits enough room to grow. Although the market environment is always accompanied by uncertainty, taking advantage of this probabilistic favorable condition may be the key to success. As long as our advantages remain solid, there is a good reason to maintain positions. On the contrary, if we are in a disadvantageous position, we should stop losses quickly to avoid further losses. As Sun Tzu's Art of War says: "Those who are good at fighting will not fail easily, and even if they fail, they can recover quickly." We must strive to improve the profit and loss ratio from a long-term investment perspective and avoid the embarrassing situation of small profits and large losses, so that we can truly grasp the big market trend.