Turtle trading rule: Turtle trading rule belongs to trend trading. First, establish the Qi Tang safe passage (which will be explained in detail below), that is, determine the upper breakthrough line and the lower breakthrough line. If the price breaks the line, do more. If the price falls below this line, close the position or short it.

When only bulls are discussed:

1. If the target price falls below "ATR of -0.5( 1,1.5,2) times the average position", the position will be closed to 75%(50%, 25%, 0%) of the original position.

2. If the target price falls below the lower rail of Tangqi 'an Road, close the position.