The efficient utilization of fossil fuels is one of important ways to achieve "carbon peak" in iron and steel industry. It is essential to implement the refined utilization of fuel to carbon reduction during the iron ore sintering. Therefore, it is prior to find out the partition laws of fuel in granules with various sizes and sinter layer for high-efficiency fuel combustion. Based on the improved Litster’s granulation model, this paper simulates the aggregation behaviours of fuel with different granules and study the influence laws on fuel distribution of different sizes granules with fuel ratio and fuel particle size distribution of raw materials. The simulation results show that fuel distribution of different granules is affected by the size distribution of granules, and the fuel content of coarse and fine granules is lower than 15%, while that of 3-5mm size is higher than 40%. With the decrease of fuel ratio in ore blends, the fuel distribution of granules presents that the fuel content of coarse granules increases and the fuel content of fine granules decreases. As the content of -0.5mm fuel particles increases, the fuel distribution of granules presents opposite trend. In addition, the fuel distribution of sinter layer is further simulated with ratio and fines of fuel, which indicates this model can provide a theoretical support for the control of fuel particle sizes in ore blends.