Abstract: In this paper, a simulation model composed of sodium flow calculation model and thermal analysis model was developed for sodium-cooled fast reactor intermediate loop flow and thermal analysis using Matlab/Simulink software. Sodium flow calculation model was based on similarity theory, hydraulic performance characteristic of pump and pressure drop of intermediate loop, and SFAC V1.0 was programmed. The sodium flow calculated by this code is in good agreement with the experimental data, and the maximum relative error is about 5%. The pipeline was divided into several segments and differential equations for energy conversation on each segment were established, resulting in a heat transfer calculation model for pipeline. The sodium flow control was also studied in this research, and control parameters were set by tuning methodology. The flow regulation was simulated to evaluate this strategy, and the control quality of this strategy is rather high.