根据中国快堆发展战略的初步研究,发展阶段分为三步:实验快堆,模块快堆和大型快堆。文中给出了中国快堆发展的第一步——快中子实验堆FFR的设计需要、主要设计选择和设计前提。包括堆中子物理、堆芯组件、热工水力、反应堆本体结构、燃料操作系统、热迁移 According to preliminary research on the development strategy of China’s fast reactors, the development stage is divided into three steps: experimental fast reactor, module fast reactor and large fast reactor. The paper gives the first step of the development of China fast reactor - FFR design requirements, main design choices and design preconditions. Including heap neutron physics, core components, thermomechanical, reactor body structure, fuel operating system, heat transfer