Abstract: Since the reform and opening up, China's urbanization process has accelerated gradually and the agglomeration ability of urban agglomeration is increasing continuously. Therefore, the phenomenon has achieved great attentions of many research organizations and researchers. In this work, we focused on the research characteristics, core authors, star organizations and research hotspots and so on. These research situations of domestic urban agglomeration were summarized and reviewed based on CiteSpace, VOSviewer and other visualization tools, which can give a reference to future research. The research conclusions can be summarized as follows: The development speed of domestic urban agglomeration research was slow in early stage and became rapid in later stage. A large number of core authors have emerged and formed cooperative networks centered on these authors. The number of papers published increased greatly after 2005, and at the top of the list are these star research institutions: Institute of Geographic Sciences and Natural Resources Research, School of Environment of Northeast Normal University, Nanjing Institute of Geography & Limnology. The theme and content of urban agglomeration research are constantly enriched, the research methods and techniques are keep improving, and more and more quantitative models are used. The research hotspots are focused on "spatial structure", "economic connection", "urbanization", "modeling", and the focus of research region starts to turn from southeast coast towards inland. Finally, the paper reviews and comments on the study of Chinese urban agglomeration, and looks forward to the future research contents, data methods and practice level of urban agglomerations.