Abstract: A plasma Yagi antenna was designed based on the traditional theoretical analysis of Yagi antenna, S₁₁parameter is patterns were simulated by CST software. According to the simulation, we manufacture plasma Yagi antenna principle prototype and S₁₁parameter is measured by a vector network analyzer ,which is consistent with the simulation results .The results show that the plasma Yagi antenna has good directivity and high gain as the plasma density is high enough. The performance can be compared with the metal antenna.