Abstract: In wireless power transmission system, high power transmission, high efficiency rectification are key technologies, among which high efficiency rectification is a special technology different from traditional wireless systems. Firstly, the technical scheme and achievements of typical domestic and foreign products for two types and four kinds of microwave power sources are demonstrated. Then, the developments and research focus on diodes, transistors and vacuum electronics are systematically discussed. Finally, strategies and solutions to the technical challenges in construction of long-life multifunctional public wireless power transmission system, such as high efficiency, high dynamic and high integration are proposed. In addition to this, the key technologies and products of space-oriented wireless high power transmission system are sketched out and further refined, and the core components and system architecture for wireless power transmission in China are prospected.