Water conservancy projects like hydroelectric stations can impact ecosystems. The Three Gorges Dam has caused Poyang Lake's water level to drop, making the dry season longer. To address this, a sluice may be built to regulate water levels. By using a model to simulate different water flows, it was found that without intervention, Poyang Lake's ecosystem will deteriorate. However, building a sluice and ensuring connectivity for migratory creatures can improve the lake's ecosystem quality. The study also suggests using ecosystem stability and regime shift indexes for future assessments.