Stop loss is not only an idea, but also a plan and an operation. The concept of stop loss means that investors must understand the significance of stop loss in stock market investment from a strategic perspective, because in a high-risk stock market, survival is the first thing to talk about before further development, and the key role of stop loss is to make investors survive better. It can be said that stop loss is one of the most critical concepts in stock market investment. Stop loss plan refers to how to make a stop loss plan before an important investment decision is implemented. The most important step of stop-loss plan is to determine the specific stop-loss position according to various factors (such as important technical position or financial situation). Stop loss operation is the implementation of stop loss plan and an important step in stock market investment. If the stop loss plan cannot be transformed into a real stop loss operation, the stop loss is still an armchair strategist.