梯底是看涨反转形态，用于确认趋势。
图上显示连续三天收低的阴烛。第四根蜡烛显示市场在开盘价上方交易。该形态出现在市场上有明显下跌趋势时。它显示虽然市场收盘创下新低，但买方足够强大。下一日价格上涨但并未反转趋势。最后一天的收盘价高于前两天。
1. 图上有三根连续收低的阴烛。这一形态和三只乌鸦类似。
2. 第四根为有上影线的阴烛。
3. 最后一根蜡烛是阳烛。开盘价高于前一天的蜡烛。
市场正在下跌，空头掌握大局。然后，在价格迅速下跌之后价格涨至开盘价上方，并且几乎达到了前一天的高点。然而市场在当天收盘时创下新低。
此类市场变化通常吸引那些明白市场不会永远下跌的卖方。最终，交易者们重新考虑他们的空头头寸，并且一旦利润令人满意，他们将在第二天结束交易。这些行为导致第二天上涨跳空，价格收于新高。最后一天的大交易量是趋势反转的信号。
该形态的四根阴烛可长可短，但收盘价应该逐渐降低。最后一根蜡烛总是阳烛。它可长可短，但当天的收盘价必须高于前一天的高点。
梯底形态可以转变为看涨锤头形态。
梯底的形成和藏婴吞没形态相似。形态的头三根蜡烛看起来像三只乌鸦，但市场是下跌趋势。
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