[Drawing and using trend lines]—MSN Community
When performing technical analysis, trend lines are a common technical tool used to depict the direction of price movement and potential support and resistance levels. In an uptrend, prices will continue to make higher highs and lower lows; while in a downtrend, prices will continue to make lower highs and lower lows.
When the trend line breaks out, the easiest way to use it is to trade at the trend line. For example, in a downward trend, the price-performance ratio of high positions must be greater than that of low positions. Since it is always suppressed by the downward trend line, the price-performance ratio is the highest when the downward trend line is the shortest, and a breakthrough is a stop loss. On the contrary, in an upward trend, the price is constantly supported by the upward trend line, so the price-performance ratio of going long at the trend line is the highest, and if it falls below the stop loss.