Abstract: Taking the main process systems of China Experimental Fast Reactor (CEFR) as the research object, all the related simulation models were built on the MATLAB/Simulink platform. In research of the capabilities of the pool-type sodium-cooled fast breeder reactors like CEFR, the models under load step disturbances without exerting control systems were simulated. The dynamic characteristics of the key devices and systems were analyzed to explore the possibilities of the load-following operational mode, thus providing references for the design of future demonstration fast reactors. Simulation results show that the load-following capacity of CEFR is unsatisfactory, for which the once-through steam generator may be the choke point.