The application of the power network automatic switching system in the regional power grid energy management system（EMS）is introduced.The logic modeling is built in the EMS.The logic judgment is realized by using the substation telemetering，telesignaling and other real-time information collected by EMS.In the event of a fault，the automatic switching system uses the way of remote operation to disconnect the power supply，and to switch on emergency power supply.This paper introduces the unified representation of network switching logic，the complex connection and operation mode of power grid fault recovery process，and the method for the automatic generation of model.System architecture can ensure safety with a variety of measurement ensuring the system security and reliability.Engineering application indicates that the power network automatic switching system can effectively improve the reliability of power supply.