Aiming at the sintering of thick material layer dominated by fine-grained iron ore concentrate,a fuel divided addition strengthening technology is used to study the effects of secondary coke powder ratio and coke powder mass fraction of less than 0.5 mm size fraction on the sinter production and quality of fine-grained iron ore concentrate,and the changes of mineral composition and microstructure of sintered products are analyzed. The results show that the mass fraction of less than 0.5 mm size fraction of coke powder used for sintering is 51.85%,and the particle size is small. Under the optimized conditions of granulation moisture of 8.0% and coke powder ratio of 5.3%,the sinter production and quality indexes can be improved by adding suitable fuel (coke powder). When the secondary coke powder ratio is 50% ,the yield of sinter,the tumbler strength and utilization coefficient increases by 1.68%, 1.16% and 3.64% respectively on the basis of the secondary coke powder ratio of 0,and the solid fuel consumption decreases by 1.42%. Therefore,suitable solid fuel addition can improve the microstructure of sinter and increase the volume fraction of calcium ferrite in needles and strips with good crystallization.