Recently studying technical analysis, I found that many people don't have a deep enough understanding of flag patterns. In fact, this tool is especially useful in trending markets, helping you determine whether to continue chasing or to reverse your position.

Let me first explain the basic logic. Bull flags and bear flags are continuation patterns, usually appearing before a trend has fully played out. A bull flag typically forms during an uptrend, indicating that prices will continue to rise; conversely, a bear flag appears during a downtrend, suggesting that downward pressure will persist. Both patterns have two core components: one is the pole (the strong upward or downward line), and the other is the flag itself (a rectangular consolidation zone).

Regarding actual trading, the method for trading bull flags is as follows. First, you need to identify this pattern during the consolidation phase, when the price is oscillating between two parallel lines. The key entry point is when the price breaks above the upper boundary, which signals a buy. How to set profit targets? Measure the height of the pole and add it to the breakout price. For example, looking at the ETH/USDT daily chart, suppose the lower boundary of the flag is at $2,500, the upper boundary at $2,800, and the pole height is $300. If the breakout occurs at $2,400, then the target price is $2,700. To manage risk, you can set a stop-loss below the flag.

The logic for bear flags is the reverse. When the price breaks below the lower boundary of the flag, that’s your entry point, and subtracting the pole height from the breakout price gives the target. The stop-loss is set above the flag. A detail worth noting: during consolidation, it’s best not to exceed 50% of the pole height; exceeding this ratio indicates insufficient trend strength and may be a false signal.

Another important point is not to confuse flags with pennants. Both have poles, but pennants form a triangular consolidation, while flags are rectangular—that’s the difference.

When trading with bull flags, be cautious because there’s a risk of false breakouts. The price may break key levels and then quickly retrace, so many traders combine indicators like RSI for confirmation. Also, watch the volume; genuine breakouts are usually accompanied by a significant increase in volume. If you want to be more cautious, wait for clear trend confirmation signals before entering, rather than acting immediately at the first flag signal. My habit is to look at multiple indicators simultaneously, which can reduce the chance of being fooled. Overall, flag patterns are indeed useful tools, but always remember there’s no 100% certainty—risk management should always come first.