Abstract: China Experimental Fast Reactor (CEFR) is a key project of the National High-tech Research and Development Program and a major step in the three-step strategy of “thermal reactor, fast reactor and fusion reactor” of China’s nuclear energy. The project achieved its first physical criticality in 2010, and the first grid-connected in 2011, realizing the breakthrough of China’s fast reactor from technology R&D to engineering project. Through the implementation of CEFR project, China’s fast reactor technology has made comprehensive breakthroughs in fast reactor physics, thermal-hydraulics, reactor safety, sodium technology, as well as fast reactor power plant design, construction, commissioning, operation and other aspects. And China ranks among the advanced countries in fast reactor development. On the basis of CEFR, the demonstration fast reactor project was approved and implemented, and the 1 000 MWe grade commercial fast reactor is also under development.