面对未来网络对全维度空间泛在互联互通的信息服务需求，现有的卫星互联网基础架构及由此构建的技术体系在异构协同、资源高效、精准按需、稳定可靠等方面仍面临重大挑战。本文首先对我国卫星互联网技术发展需求进行分析研判，讨论了全球卫星互联网技术的发展现状和趋势；其次阐述了代表性的天地协同广域通信网络组网架构、全维可定义的网络节点；最后从网络智能切片、数据解析与转发、资源协调控制机制等方面，提出天地协同网络中面向业务特性的智能切片关键技术。研究建议：依托天地协同网络架构，以网络资源管理控制、网络智慧化、网络结构全维可定义等技术为支撑，突破业务所需的天地协同网络资源智能切片、全维可定义的数据报文灵活解析与转发、天地协同网络资源全局协调控制等关键技术；在国家层面加大对天地协同网络的政策支持力度，为天地协同网络资源全局动态优化技术创新和产业发展提供持续推动力。

Future networks demand ubiquitous and interconnected information services in a full-dimensional space. However, the infrastructure and the deriving technology system of the existing satellite Internet still face unprecedented challenges in terms of heterogeneous collaboration, resource efficiency, precision on demand, stability, and reliability. In this article, we analyze the development demand for satellite Internet in China and discuss the development status and trend of satellite Internet worldwide. Subsequently, we elaborate on a typical space–ground cooperative networking architecture and full-dimension definable network nodes. Ultimately, we propose the key intelligent-slicing technologies for a space–ground cooperative network in terms of network intelligent slicing, data analysis and forwarding, and the resource coordination and control mechanism. Furthermore, a development route is proposed for the intelligent slicing technology. Breakthroughs should be made on key technologies such as the businesson-demand intelligent slicing, data analysis and forwarding with full-dimension definability, and the global source coordination and control technologies; these breakthroughs should rely on the space–ground cooperative network architecture and supported by technologies such as network resource management and control, network intelligence, and full-dimension definability of the network architecture. This will ultimately provide continuous impetus for the innovation of the global dynamic optimization technology of the space–ground cooperative network resources.