Through using visualization technology and mapping knowledge domains, the paper explores the present situation and frontier domains of tacit knowledge. The data that the study used are downloaded from Web of Science and indexed by the topic word "tacit knowledge". Three results were obtained in the paper. First, more and more scholars especially from business management are focusing on research of tacit knowledge. Second, the document co citation map identifies several core authors and important literature from knowledge management, psychology and philosophy. Third, the frontier trends are presented by mapping on network of document-burst in tacit knowledge.