Abstract: Sometimes, the emergency operation Procedure implemented after the accident is related to the emergency IC and EAL. However, the basis of the emergency IC and EAL is the indications and parameters representing plant safety state, and the basis of the EOP is the events and accidents, and sometimes the indications and parameters is same in emergency IC and EAL and EOP, sometimes they are different in EAL and EOP. The correlations EOP with emergency classification level, recognition categories, IC and EAL are discussed and the application of EOP in establishing IC and EAL is proposed in the paper.