Desalination is the production of fresh water by desalting seawater. It is an open source incremental technology to realize the utilization of water resources, which can increase the total amount of fresh water, and is not affected by time, space and climate. It has good water quality and reasonable price, and can ensure stable water supply for coastal residents and industrial boilers. The process of obtaining fresh water from seawater is called desalination. Desalination is mainly used to provide water for drinking and agriculture, and sometimes edible salt is produced as a by-product. Desalination is popular in various regions of the globe, especially the Middle East, and is also used on certain islands and ships.