Stop loss point refers to the maximum loss allowed by trading position in the stock market. Once the loss limit is reached, traders must close or lighten their positions to prevent the loss from expanding. Stop loss is a necessary means to control risks. How to make good use of stop-loss tools, investors should have their own style. In trading, it is very important for investors to grasp the overall position and trend of the market. Stop loss should be used more in the high-priced circle, less or no in the low-priced circle, and it depends on the market movement trend in the middle-priced circle. Taking advantage of the trend and making good use of stop loss points are the only way for investors.