Abstract: The fire protection design of the 3rd generation passive pressurized nuclear power plant（AP1000 for short） in U.S.and the 3rd generation innovation pressurized nuclear power plant（EPR for short） in France and the 2nd plus generation pressurized nuclear power plant（CPR1000 for short） in China are introduced and compared.In respect of the purpose and principle of fire protection,fire prevention,fire detection and alarm,the smoke control of these three PWRs are basically the same.Due to the passive design,AP1000 fire water supply system is designed on the basis of "Different Solutions for Different Cases,Critical Defenses for Critical Places",comparing with the other two types,with more complexity in the classification of FPS,increasing the functions and diversification of the system and decreasing the fire load.