Abstract: An effective emergency response system is the basis of accident management in case accident. The accident of Fukushima Daiichi Nuclear Power Plant suggests that extreme external hazards may affect the normal emergency system of the nuclear power plant, which results in the difficulty of accident mitigation. In hence, based on the research of the emergency system in the nuclear power plant, a recovery method of command and control is proposed aiming at extreme external hazards. In addition, multi-sites issue is concerned in the recovery analysis. The product of this paper can be a beneficial reference for NPPs to deal with the extreme external hazards.