The white horizontal line in the figure is an effective upper fractal, and the yellow horizontal line is an effective lower fractal. The upward breakthrough will test the rectangle on the track, and the downward breakthrough will test the rectangle on the track. At present, ac and ao support upward breakthrough. Once the breakthrough occurs, the position of the green horizontal line in the backtesting will be long. Stop loss yellow line. However, ao has a deviation at present. In short, wait for breaking through an effective fractal, and then do the backtesting.