Based on nearly 30 years collection of knowledge graph macro subject literature, the paper shows the trend of the development of the knowledge graph. Keywords co-occurrence is used to present knowledge graph topic in the field of the structure and interconnection. Based on the description of hot frontier, the theme of the analysis of the content level framework is constructed. In-depth analysis was made from the entity disambiguation, relationship expansion, graph improvement, graph integration, correlated data, and dynamic building to summarize the present situation of the application of knowledge graph. It also reveals the development trend of knowledge graphing.