The construction of the Longxikou Navigation-power Junction cuts off the original channel of river fish migration.To ensure the ecological connectivity of the upstream and downstream of the junction,we arrange the imitated natural ecological fishway based on the principles of physics and ecology to provide a good backtracking channel for fish.The imitated natural ecological fishway of the Longxikou Navigation-power Junction project has many difficulties,such as ultra-long length,multi-bending,difficult excavation of lotus joints,high construction intensity,and tight construction period.The requirements for water flow control of the imitated natural ecological fishway and water ecological environment simulation of fish backtracking are high.Thus,the actual excavation of natural riverbeds is simulated,the excavation shapes with various measuring equipment are accurately controlled,and the ecological deep pool lounge is employed.Meanwhile,various new construction technologies are innovatively applied,including spray mixing integration and slurry masonry integration.Finally,the fishway construction accuracy and efficiency are improved to create a good water flow environment for fish migration and promote the ecological environment circulation stability of the Minjiang River Basin.