In order to solve the problem of increasing solid fuel consumption caused by the poor segregation effect of the mixture distribution of Meigang No. 5 sintering machine, the laboratory simulation distribution device and the sintering cup test are designed to study the influence of different gas injection speeds on the particle size and fuel distribution of the mixture. The sintering mixture gas injection device is developed for industrial application test, the suitable injection medium is determined, and the influence of gas injection on the temperature, particle size and fuel distribution of the mixture is analyzed, as well as the effect on sintering technical index is improved. The results show that, with the increase of gas injection speed, the segregation degree of mixture particle size and fuel distribution increases. After using the gas injection mixture with a flow rate of 50 m/s, the sintering cup test is carried out, and the utilization coefficient of the sintering machine is increased by 0.024 t/(m²·h), the sinter yield is increased by 0.93%, and the solid fuel consumption is reduced by 0.8 kg/t. The results of industrial application show that compressed air is suitable for gas injection, the temperature of the mixture is reduced by 0.9 ~ 1.3 ℃, the particle size segregation index of the mixture is increased from 0.77%/m to 1.66%/m, the fuel segregation index is increased from -0.156%/m to 0.382%/m, the sinter yield is increased by 1.62%, and the fuel consumption is reduced by 2.26 kg/t. Gas injection segregation distribution technology has a small space occupation and low cost, which can significantly improve the particle size and fuel distribution of the mixture, and increase the yield of sinter.