The drafting of IEC 61970/ IEC 61968 series standards have provided criteria for the interoperation among power grid dispatching automation systems. The detailed CIM/CIS interoperation criteria based on IEC 61970/ IEC 61968 standards are worked out， including the clarification of the interchanging pattern involved among systems， the interfacing approaches used， and the graphic interchange standards covering the definition of element details. The interconnection， separation， and integration of dispatching automation models based on the criteria proposed are also discussed. The definition of details helps eliminate the misunderstanding in the application of these standards， carry out construction， maintenance， and upgrading the power grid dispatching automation system effectively as well as promoting the sharing of model and information in the multi-level power grid dispatching automation systems.