Based on the present dynamic reconfiguration technology and computer network reconstruction technology，the concept of dynamic reconfiguration is described，and the usability and advantages of dynamic reconfiguration technology in the secondary system of the intelligent substation are analyzed.A device design method for equipment reconstruction in the secondary system is proposed by dividing the dynamic reconfiguration of the intelligent substation into equipment reconstruction and system reconfiguration，and the feasibility is discussed.The demand for system reconfiguration is analyzed，and the content，mode and criterion of the system reconfiguration are discussed.Finally，the key points of the method and the difficulties in dynamic reconfiguration are analyzed，and the problems to be studied in future are pointed out.