Considering the lack of systematic reviews on e-government research, this study includes research categories, spatial structure, research paradigms and noteworthy future topics in the domain of e-government. We collect 142 keywords from 2646 papers published in the Web of Science from 2000 to 2019 as the study object. Then, we identify four research categories: (1) technology and modelling in e-government, (2) drivers of e-government development, (3) public management and (4) governmental management. From public and government perspectives, we outline the spatial structure which includes theories and practices research and conclude four research paradigms: (1) theoretical modelling and application, (2) e-government development, (3) status of public management and (4) status of governmental management. Finally, we develop a 3D spatial map to analyse noteworthy topics and explore the well-studied themes: government-to-citizen, government-to-government and government-to-business, and the under-studied themes: government-to-civil society organisations and citizens-to-citizens, which helps scholars research e-government roundly.

考虑到对电子政务研究缺乏系统的评论，本研究包括电子政务领域中的研究类别，空间结构，研究范式和值得注意的未来主题。我们从2000年至2019年在Web of Science上发表的2646篇论文中收集了142个关键字作为研究对象。然后，我们确定了四个研究类别：（1）电子政务中的技术和建模；（2）电子政务发展的推动力；（3）公共管理和（4）政府管理。从公共和政府的角度出发，我们概述了包括理论和实践研究在内的空间结构，并归纳出四个研究范式：（1）理论建模和应用；（2）电子政务发展，（3）公共管理地位和（4）政府管理地位。最后，我们开发3D空间地图来分析值得注意的主题，并探索经过深入研究的主题：政府对公民，政府对政府和政府对企业，以及未被充分研究的主题：政府对民间社会组织和公民对公民，这有助于学者全面研究电子政务。