The South-to-North Water Diversion Project is an important strategic infrastructure for realizing the optimal allocation of water resources in China. Since Phase I of East-Middle Route of South-to-North Water Diversion Project was fully open to water five years ago, the local water resources stock in the receiving area has been revitalized through the introduction of high-quality water resources increment, which has effectively curbed the trend of serious deterioration of ecological environment caused by the over-exploitation and utilization of water resources in the Huang-Huai-Hai Plain, playing an important role in improving the water resources regulation ability under the background of climate change.