Ecological civilization construction, as the bedrock of sustainable development for the Chinese nation, holds profound and significant strategic importance. Located at the junction of Shandong and Jiangsu provinces, Weishan Lake serves not only as an indispensable key regulating reservoir for the South-to-North Water Diversion Project but also harbors exceptionally rich fishery and water resources. However, owing to its unique geographical position and the significant economic value of its resources, it has long been a focal point of contention between the two provinces. This has led to a stalemate in bilateral relations, posing severe challenges to the balance and stability of the ecosystem. It systematically examines how the lake has achieved a virtuous cycle of ecological and economic coexistence through optimized inter-governmental coordination and innovative multi-center governance practices.