文章对第六代移动通信系统（6G）的总愿景和发展趋势进行了初步探讨，认为基础信息理论的突破是6G发展的源点，发展方向是为人类可持续发展的个性化需求服务。文章将网络主体从“人-网-物”3个维度拓展至“人-网-物-境”4个维度，认为未来6G将会改变人类广义概念上的“环境”，归纳了6G网络至少4个新形态：无人不互联、无处不互联、无时不互联和无事不互联。6G遵循以TRUST为原则的网络性能发展趋势，即向Tbit/s级以上带宽、超高可靠性、泛在连接、亚毫秒时延和包括太赫兹频谱、可见光通信以及当前正使用频谱在内的更广域频谱等方向演进，形成网络性能更高级发展阶段。最后，文章阐述了6G网络不同维度的各子愿景的需求和面临的挑战，后续将会对关键性技术逐步开展研究和修正工作。

This paper makes a preliminary study on the visions and trends of the 6G mobile communication system. It believes that the breakthrough of basic information theory is the starting point of 6G development, and the development direction is to serve the individualized needs of human sustainable development. The paper preliminarily outlines the 6G’s total vision and the vision of each dimension. Then, we expand the actors from the three dimensions of “humannetworkthing” to four dimensions of “humannetworkobjectenvironment”, in the network. It is believed that future 6G will change the “environment” of the broad concept of human beings. We summarize the four new forms of 6G networks: interconnection of whomever, wherever, whenever and wkam. The development trend of 6G network performance should follow TRUST principle, including more than Tbit/s level bandwidth, extreme Reliability, Ubiquitous connectivity, Submillisecond delay, Terahertz spectrum, visible light communication and spectrum currently in use （including but not limited）. Finally, the paper expounds the representative key theoretical, technical and academic research results from different layer of the 6G network.