Knowledge graph technology is a new method describing the complex relationship between concepts and entities in the objective world, which has been widely concerned because of its strong knowledge inference ability. Dispatching and control center is the central hub of power grid operation control. In order to promote the construction of intelligent dispatching and control, combined with the technology of knowledge graph and the specific situation in the field of dispatching and control, this paper proposes the construction method of knowledge graph oriented to the field of intelligent dispatching and control. Furthermore, the application solutions of knowledge graph for supporting the scenario of fault handling, operational rule electronization, breaker operation and dialogue question and answer are put forward. Finally, the knowledge graph of line fault handling is constructed, showing that the established knowledge graph can drive the process of line fault handling automatically, and the accuracy of judgment and identification process is higher, which effectively reduces the risk of manual handling. This work is supported by National Key Research and Development Program of China (No. 2018YFB0904501).