Abstract:The present research state and future development tendency of terahertz high speed wireless communication at home and abroad are reviewed and analyzed comprehensively. Firstly, the features, frequency band and modulation mode of terahertz communications are introduced. And then the key techniques of terahertz communications, including terahertz generation, amplifier, detection, modulation/demodulation and transmission are discussed, as well as high speed data stream construction, network protocols and integrated microsystems technology. Several typical terahertz communication demonstration systems developed in Japan, Germany, America and China are also highlighted. Perspectives on the applications of terahertz high speed wireless communication and further research directions are presented at last.