Abstract: Topology analysis of power grid is widely used in power system operation and planning. In the existing research, the topology information of power grid is mostly stored on disk in the form of relational database or graph database, and the query speed is limited by the characteristics of the database itself. In order to improve the query speed of power grid topology information, this paper proposes a method of building and querying power grid topology model based on in-memory graph database RedisGraph. Firstly, this paper summarizes the data structure of CIM/XML file and the way of storing data in RedisGraph. Then, according to this, a scheme of converting CIM/XML data model into power grid topology data model is designed, and topology search based on RedisGraph is realized. Finally, topology search test is carried out based on the built graph data model. The results show that the grid topology storage and query scheme based on RedisGraph proposed in this paper can better meet the performance requirements of large-scale complex grid topology analysis business.