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As the limitation of single stream processing and imperfections of security in the existing smart grid, a system under software-define networking (SDN) framework that is used to efficiently handle IEC61850 based grid systems is proposed. The system implements OpenFlow, sFlow and OF-Config protocol, and its main advantage is that it can identify types of date stream according to the network status and their needs. In addition, IEC 61850 based substation network management and control of the business must be proprietary system software, which enables versatility by standard solution. Firstly, the data layer decoupling control and management (C&M) is given. Then, CEN-CENELEC-ETSI Smart Grid Coordination Group is referenced, and the functions and applications of the new system are introduced. Finally, the system is implemented on the Mininet network simulator and the performance is tested. Experimental results show that proposed system has outstanding performance on the flow control testing, DOS attack detection and load balancing.