1. Because the levees of the Yangtze River and its tributaries are generally earth dikes, puddles, ponds and low-lying lands are often formed on the back surface when soil is taken to build dikes, which becomes the best place for the growth and reproduction of Procambarus clarkii. Procambarus clarkii likes to burrow, and the burrowing speed is fast and the range is large, so Procambarus clarkii is more harmful to dams than termites.

2. Procambarus clarkii is also very destructive to fish, especially young fish. Because crayfish breed quickly, it will compete for a lot of fish food and will also feed on young fish.

3. Procambarus clarkii flooded the terraced fields. Because Procambarus clarkii "drilled holes" in the lifting points, it directly caused irrigation water loss and ridge collapse, which affected the protection and application of terraced fields.

4. Procambarus clarkii is an invasive species, and a large number of Procambarus clarkii has destroyed the original local ecology. In addition to competing with the original fish and loach for living space, crayfish will also eat rice crops, which will affect the grain output in the later period.