Some iron and steel enterprises in Chinese inland areas have abundant iron ore resources，and some of their self-produced iron ore concentrate is used for sintering production，which is of great significance for reducing costs and increasing efficiency. In this paper，the ratio of concentrate and fine ore is adjusted for mixing and granulation，the sintering cup is used to simulate the industrial sintering process，and the sintering indexes such as vertical sintering speed，yield rate，drum strength and utilization coefficient are detected，and the influence rule of iron concentrate ratio on granulation effect and sintering index is studied，and its mechanism is analyzed. The results show that with the increase of concentrate ratio from 0 to 100% ，the permeability index of the material layer decreases. The reason is that with the increasing proportion of concentrate，its drying and depowdering rate is increased from 7. 71% to 20. 34% ，which leads to the merger and growth of pellets during granulation，which makes the strength of pellets decrease and easy to fall off and crush，thus affecting the permeability of the material layer. When the concentrate ratio is increased from 35% to 50% ，the permeability of the material layer is good，and the sintering index is at an excellent level. When the concentrate ratio is increased to 100% ，the mass fraction of hematite in the finished sinter is decreased from 35. 00% to 22. 20% ，the mass fraction of magnetite is increased from 28. 40% to 43. 50% ，the total amount of iron oxide is increased，and the mass fraction of calcium ferrite is decreased from 29. 30% to 25. 00% ，which reduces the strength of sinter. Therefore，the suitable concentrate ratio range is 35%~ 50%. The results have an important guiding role in the application of high ratio of iron ore concentrate in sintering.