IEC 61970 and IEC 61850 are the core standards of Smart Grid, and have been widely used in electric power automation. As these two standards defined data models and the interface respectively, the result is the models are not uniform and seamless communication cannot be operated between substation and the control center. This paper proposes two aspects differences, data model and service model. IEC 61970 defines the power of information model and broadly applied to enterprise integration. IEC 61850 is limited to exchange of data within substation equipments. IEC 61970 defines application program interface (API) and IEC 61850 defines abstract communication services interface (ACSI). To make the difference clear, it is benefit for harmonization the power data model.