布林线（Boll）指标是股市技术分析的常用工具之一，通过计算股价的“标准差”，再求股价的“信赖区间”。 该指标在图形上画出三条线，其中上下两条线可以分别看成是股价的压力线和支撑线，而在两条线之间还有一条股价平均线，布林线指标的参数最好设为20。一般来说，股价会运行在压力线和支撑线所形成的通道中。 与MACD、RSI、KDJ等指标一样，BOLL指标也是股票市场最实用的技术分析参考指标。
布林线技术指标和移动平均包络线相同，但是不同是外部布林线是怎样创建的。
A Bollinger band technical indicator looks similar to the moving average envelope, but differs in how the outer bands are created.
紧凑的布林线被交易员认为是整体波动增加将会出现价格剧烈变动的早期信号。
The tightening of the bands is often used by traders as an early indication that overall volatility may be about to increase and that a trader may want to wait for a sharp price move.
通常，向上部布林线移动经常意味这个资产将会被超买，向下部布林线移动则意味将会被超卖。
In general, a move toward the upper band can often suggest that the asset is becoming overbought, while a move close to the lower band can suggest the asset is becoming oversold.
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