The integration of BIM and big data provides a new method for intelligent project management, which has attracted much attention from scholars at home and abroad in recent years.In order to more comprehensive understanding of the research in this field, With research literature of Web of Science database and journal literature of database as data sources,Using bibliometrics and visualization method, Using Citespace and Ucnet as analysis tools, combing the literature published during 2014-2019, a visual knowledge mapping, from two aspects of research hot spots, evolution trend are analyzed.The results show that the research on BIM+ big data integration at home and abroad has its own emphases. It is a future research trend to deeply integrate emerging technologies such as Internet of things, cloud computing and artificial intelligence with the aim of intelligent management and intelligent decision-making, and to serve the development of smart city construction and smart construction.