An important part of the Yangtze River ecosystem has disappeared. As the top predator of the Yangtze River, the white sturgeon was once at the top of the food chain, and its extinction symbolized the irreversible interference to the natural environment. This not only reflects the impact of human activities on biodiversity, but also highlights the urgency of ecological protection. The extinction of ACIPENSER sinensis is caused by many factors, including the change of river ecosystem, the decrease of food sources and the influence of human activities. These factors * * * caused the paddlefish to lose the ability to reproduce in the natural state, which led to the disappearance of the whole species. The extinction of the paddlefish is a tragedy, which reminds people to pay more attention to the protection of the ecological environment and take effective measures to reduce the impact on the natural environment, so as to ensure that other biological populations do not suffer the same fate.