Based on the overall vision of the Sixth Generation Mobile Communications（6 G） and the different dimensions of the sub-vision

the article outlines key technology trends and challenges that are likely to achieve these wonderful visions. This article is based on new basic technologies such as new composites

meta-materials

non-orthogonal waveforms

high-frequency millimeter and terahertz waves generation

to network-based technologies such as wireless new Internet infrastructure and deep-sea communication networks. Emerging application technologies such as perceptual interconnection and human body communication are introduced in different categories to select key technologies that are full of opportunities and challenges in the 6 G era. This article cites the relevant content and research results of some of the top international academic journals

and strives to be as rigorous and reasonable as possible

with a view to attracting industry attention to the development trend of 6 G mobile communications.