物联网作为新型数字基础设施的重要组成部分，与第五代移动通信、大数据、云计算、人工智能、区块链、数字孪生等技术深度融合，正在深刻改变技术产业体系、推动数字经济快速发展，开启了万物智联的“智慧物联网系统”新阶段。本文梳理了我国物联网的发展现状，提出了智慧物联网系统（物联网2.0）概念并阐述了其内涵、体系架构、技术谱系、使能关键技术；针对智能制造、智能农业、智能电网、智能医疗、智能交通、智能环保等领域的应用场景，提炼了智慧物联网系统的实践案例，展示了智慧物联网系统的应用价值。研究建议，实施“物联网+人工智能+新一代信息通信技术+新应用领域专业技术”技术融合创新专项，关注智慧物联网系统 / 云原生平台 / 低代码（无代码）应用开发环境及工具集、面向智慧物联网系统的高端传感器、物联网芯片 / 专用器件等智能产品的研发与产业化，开展云边端协同、自主可控、安全可信的智慧物联网系统应用示范。

The Internet of Things (IoT) is an important component of the new digital infrastructure and is deeply integrated with the fifth-generation mobile communication (5G), big data, cloud computing, artificial intelligence (AI), blockchain, and digital twin. It is profoundly changing the technology system and promoting the digital economy, ushering in a new stage of smart IoT system in which everything is connected. This paper reviews the development status of IoT in China, proposes the concept of smart IoT system (IoT 2.0), and expounds on the implications, architecture, technical pedigree, and key enabling technologies. Practical cases of smart IoT system are explored considering the application scenarios of intelligent manufacturing, smart agriculture, smart grid, smart healthcare, intelligent transportation, and intelligent environmental protection, demonstrating the application values of the smart IoT system. Furthermore, we suggest that a technology integration innovation project that integrates IoT, AI, 5G, and new application field technologies should be implemented; focus should be placed on the research, development, and industrialization of intelligent products such as smart IoT systems / cloud native platforms / low-code (no-code) application development environments and toolsets, high-end sensors for smart IoT systems, and IoT chips / special components; and application demonstration of cloud-edge-end collaborative, autonomous controllable, safe, and credible smart IoT systems should be conducted.