Abstract: This paper describes and analyzes the construction principles and methods of Left-Hand Material.By the studyof patch antennas which are loaded with Left-Hand Material,we illustrate the excellent characteristics of them.Simulation andexperimental results show that ordinary patch antenna will have new features by loading Left-Hand Material,such as loweroperating frequency,increases of antenna gain,enhance of the direction and so on.Moreover,the physical size of them can begreatly reduced,which can provide new methods and ideas of designing small antenna with high gain and wide bandwith.