Seawater desalination provides a new approach to settle the water supply crisis,but a large amount of energy has to be cost during the process of desalination. Each of the several existing methods for seawater desalination has its own advantages and disadvantages, so a combination use of these methods is recommended. The solar heating equipment invented by. Zhang can be used as a good energy source, which is clean and brings no pollution to the environment, for seawater desalination devices.