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Fresh water is the most important resource for our life.In many aspects of our lives considerable fresh water are required,however lots of people in the word are suffering from shortage supply of fresh water.These days Africa suffered the worst drought in 60 years.Everybody knows that the water in the ocean is numerous.But the main drawback is that we cant use their straightly,we must transform their high salinity and change them into fresh water.Desalinated can convert seawater into fresh water for human being.There are several different desalination systems powered by renewable energy.Every system has its own advantages and disadvantage.This article emphasizes the development of solar MSF system.The cost of different MSF systems is also discussed in this article.