Abstract: The common information model (CIM) for IEC61970 and IEC61968 standards provides the models of devices, customer and their relationship, which promotes the data exchange among management systems effectively, and improves dispatching automation. However, current CIM cannot describe new devices appearing in active distribution network effectively. So, an extension method of CIM is proposed in this paper. With the help of EnterPrise Architect software, the models of distributed generation, energy storage equipment and electrical vehicle charging plant in active distribution network are extended according to CIM extension principles. Besides, direct current micro-grid is paid more and more attention due to its advantages compared with alternate current micro-grid. Therefore, the CIM models of direct current micro-grid are built, which meets the demand of message in active distribution network management system.