This paper provides a diachronic and bibliometric overview of register studies in the past decade. A total of 545 articles were selected from the field of linguistics of the database of Web of Science Core Collection for the analysis. For bibliometric analysis, CiteSpace and VOSViewer were used in order to reveal the co-citation analysis, the high-frequency keywords, keyword clusters, and the timeline of the keyword network in register studies. The results are summarized as follows. First, register studies have been gaining considerable academic attention in the examined years. Second, the major theoretical origins of register studies were text linguistics, systemic functional linguistics, and sociolinguistics. Third, corpus analysis and discourse analysis are the main research methods, followed by genre analysis, and conversation analysis. Fourth, important research themes were extracted and classified based on the following dimensions of register studies, namely, linguistic features, register types, register variations and pragmatic function. Furthermore, Teaching and education was an important dimension in register studies. Fifth, the recent research tended to focus on the register variations caused by the audiences, and corpus analysis and discourse analysis were widely used for broad analyses in different register studies. This bibliometric analysis also shows that online registers have become the research hotspot.