Optical Library Technology, ZTE, Fiberhome Communication, Fu Jeer Science and Technology, Zhongji Xu Chuang, etc., among which optical library technology may be the leader of 6G. Some people say that the research on 6G at home and abroad has just started, but it is urgent to establish relevant international technical standards, including 6G spectrum, network architecture, multiple access, wireless energy transmission, intelligence and other technologies. Recently, at the national communication theory and technology seminar forum, many industry experts said that 6G research has just started and the technical field needs to be strengthened. Unlike 5G, 6G needs to build a network to realize the integration of heaven, earth and sea. The 6g band will be extended from 5g millimeter wave to THz band. It is estimated that the data transmission rate is 100 times faster than that of 5G band, and the delay reaches sub-millisecond level. 6G will have broad application prospects in the fields of personalized service for users, Internet of Things, industrial Internet, driverless, smart factories and so on.