The problem of the interoperability between IEC 61970 and IEC 61850 in smart grid is studied. Firstly, the data structure model of the two standards is analyzed. Secondly, the possibility of the interoperability between the two data models is discussed. Finally, taking main wiring structure of double busbar with bus coupler circuit breaker as an example, the models of IEC 61970 CIM and IEC 61850 are established respectively. The data exchange and model mapping between the two standards are described in detail. The result shows that this method to exchange data between the two standards is feasible.