China is a water scarce country, especially in the northern region. How to solve the problem of rigid constraints on water resources in water scarce areas in the northern coast, Weihai City has carried out beneficial practice and exploration, and achieved great results. Weihai is located at the easternmost tip of the Shandong Peninsula, surrounded by the sea on three sides, mostly seasonal independent rivers entering the sea, and the per capita water resources are only 585m³, far less than the critical value of 1000m³ necessary to maintain the economic and social development of a region. In order to ensure economic and social development, break the constraints of water resources, and improve the efficiency of water use, Weihai City combined with the characteristics of local water resources, put forward the idea of "saving water, storing water, transferring water South to North, desalinating seawater, using reclaimed water, and treating sewage".