As a new type of solid fuel,semi coke has such shortcomings as high volatile matter and low fixed carbon content when it is used in sintering production. Modification of semi coke can compensate for the above shortcomings. The feasibility of replacing part of the coke powder in sintering by modifying semi coke is systematically evaluated through basic performance tests and sintering cup tests. Results show that the particle size distribution of modified semi coke is mainly greater than 5 mm,accounting for 46. 64%,with a fixed carbon mass fraction of 80. 97%,volatile matter of 7. 32%,and a calorific value of 27 021. 81 J/ g,demonstrating excellent combustion characteristics. Sintering cup tests show that when the proportion of modified semi coke replacing coke powder is controlled within 20%,both the drum strength and utilization coefficient of the sinter show slight improvements. Although the yield slightly decreases,the overall quality remains within an acceptable range;when the substitution ratio rises above 30%,a significant deterioration in sinter quality is observed. It is worth noting that as the proportion of modified semi coke substitution increases,the reducing performance of sinter shows an improving trend. Based on this,it is recommended to reasonably regulate the particle size composition of modified semi coke in practice,especially reducing the proportion of particles smaller than 1 mm,and appropriately adjusting the fuel mix to ensure the quality of the sinter.