Graphene is called magical material with unique mechanical and electrical characteristics, but its interaction with water is confusing: the surface of graphene repels water, but the submerged graphene film capillary channel allows rapid penetration of water. The relationship between the graphene and the water that scientists neither friendly nor aloof ". This magical characteristics based on the University of Manchester researchers have developed a new type of graphene oxide films can effectively filter the salt in seawater. Under the background of global shortage of fresh water resources, the future of this invention will have a very good application prospect in the desalination industry. The next day, whether it can become a magical invention to change the world?