Dujiangyan fish-mouth dike is an important attraction in the Dujiangyan scenic area. The fish-mouth dike, also called" fish mouth", is the most important part of the Dujiangyan water conservancy project. This is a fish mouth-shaped dam built with pebbles. Min River is divided into inner and outer rivers, and the inner river is used for irrigation while the outer river is used for flood discharge. This water project fully refelcts the wisdom of the our ancestors.