As irreplaceable snd important natural resources, fresh water is a requisite for every living thing on the earth. Many countries throughout world are actively carrying out the research on the desalination of seawater due to the crisis of water resource continuous appeared in many countries and regions. Desalination of seawater and brackish water is an important strategy to solve the fresh water shortage problem. RO has become an important desalination technology and has been widely used due to the stable and reliable project and low cost.