Desalination technology is a water treatment technology that has emerged in recent decades. Reverse osmosis technology has the characteristics of low water production energy consumption, wide application range, short construction period and no geographical restrictions. With the increasing shortage of water resources and increasing water pollution, water conservation and inter-basin water transfer cannot fundamentally solve the water shortage crisis in coastal cities. Humans began to demand water from the sea and use reverse osmosis technology to realize the resource utilization of seawater. The city offers sustainable water solutions.