During the compiling,the concept of fire barrier is the core content of building part in the national standard of Code for Design of Fire Protection for Conventional Island in Nuclear Power Plants(GB 50745—2012). The concept of fire barrier is the core content from the generation and definition of the concept of fire barrier,to make a detailed explanation and analysis on understanding and application in building fire protec-tion design of nuclear power plants. The proposing of the new design concept has an important significance for guiding the building fire protection design of nuclear power plants.%指出建筑防火分隔概念是国家标准GB 50745—2012核电厂常规岛设计防火规范编制过程中建筑部分的核心内容，就防火分隔概念的产生、定义以及在核电厂建筑防火设计中的理解和如何运用进行了详细解释和分析，新设计概念的提出对于指导核电厂建筑消防设计具有重要意义。
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