The index of the main fund line represents the strength of the main fund's position, and the red and green columns on the line represent the strength of the big fund's position increase or decrease on the same day. The upward movement of the curve means that the main funds increase their positions, while the downward movement means that the main funds reduce their positions.

Investors can also judge the trend of the main funds through the transaction volume in the five details. Generally speaking, in the fifth file, it shows that there are more large single purchases, indicating that the main funds are entering. On the contrary, when more large orders are sold in the fifth file, it means that the main funds are fleeing.