To satisfy the demanding of different fields, Metamaterials appears in twenty-first century. The innovative design of Metamaterials creates many new materials which break the limitation of nature and  lead material design into a brand new world. After a short exploration in this field, many new materials have been designed. Metamaterials including  electromagnetic Metamaterials, elastic Metamaterials, acoustic Metameterials and structural Metametirials etc have significantly changed the world.