The stop-loss strategy is the core tool for controlling investment risk, mainly including the following types:

1. Technical stop-loss: Setting stop-loss points based on technical indicators, such as breaking through key moving averages (like the 20-day moving average), trend lines, or head-and-shoulders neckline, applicable when trend reversal signals appear;

2. Dynamic stop-loss: Adjusting stop-loss positions as profits change, such as the breakeven stop-loss method (moving the stop-loss point up based on cost) or moving average trailing stop-loss, which can lock in profits and reduce drawdown risk;

3. Fixed stop-loss: Stopping losses at a fixed percentage (like 5%-10%) or amount, simple and easy to implement but needs to be combined with volatility characteristics;

4. Time stop-loss: Setting an upper limit on the holding period to avoid time loss, commonly used in short-term trading;

5. ATR stop-loss: Setting the stop-loss range based on volatility (like 2-3 times the ATR value), suitable for high-volatility markets.

Stop-loss should avoid emotional interference, and programmatic execution can enhance efficiency, while also needing to flexibly adjust in conjunction with fundamental changes (like policy risks). The core goal is to control single loss and prevent risk diffusion.