The Bollinger band consists of three lines: the upper rail (BOLL with yellow lines), the middle rail (BOLL with white lines) and the lower rail (boll with purple lines). First, the inflection point trading method:

At the end of continuous rising or falling, once the upper rail (rising process) or the lower rail (falling process) of the bollinger Band has obvious head turning (as shown in the following figure), at the same time, one or two KDJ indicators or MACD indicators issue dead forks (rising process) or gold forks (falling process), and they are sold (rising process) or sold (falling process) on the day of the head turning.

Second, the shrinking sales method:

When the upper and lower rails are close or far away, we are used to opening our mouths or closing our mouths (as shown below). General shrinkage (represented by the gray box in the figure) will be accompanied by the rise and fall of the stock price. When necking occurs, the middle rail plays a very important role. When the middle rail is in a continuous state, if the middle rail continues to rise, shrinking indicates that the stock price is resting or the main force is washing dishes. When the bollinger band shrinks and goes flat, it is to buy some. When the middle rail is reversed, if it rises or leveled, it is a buying point.

Third, the open trading method:

Once there is an opening (shown in the gray box in the figure) and the middle rail is in a continuous state, if there is an opening in the continuous upward direction of the middle rail, it means that the stock price will rise again after the position is broken, and you can consider adding positions to buy short positions; The shape of the middle rail is reversed, such as flattening and downward. At this time, opening your mouth is the selling point.