In view of the problems, that is, unsatisfactory mixing & granulation effect and poor sinter drum index caused by the mixing rate of the mixer cannot reach the design level and the difficult granulation materials are mixed in the compound in actual production, under the condition of adding 20% FMG fine ore to the 500 m² sintering machine process, combined with the Frouder criterion calculation, the process of the sintering machine compound system is studied. The results show that, when the design speed of the primary mixer is lower than the reasonable speed of 6.94 r/min, the mixing and granulating effect of the sintering compound system is poor. By taking such technical measures to reduce the proportion of water added to the primary mixer from 80% to 75%, and the position where it added water is extended by three meters from the original position, the mixing and water potential of primary mixture are promoted, so as to enhance the granulation coefficient of the compound is increased from 39.12% to 48.98%, the problems of bonding and agglomeration of the sintering compound and poor granulation effect are resolved after adding 20% FMG fines, the uneven cross-section of the sinter is eliminated, and the sinter drum index is increased from 76.14% to 78.44% finally.