The bonding phase strength is one of the important indicators to measure the basic characteristics of iron ore powder sintering. The mineralogical characteristics of iron ore powder itself are closely related to the bonding phase strength. Based on the study of the mineralogical properties and basic characteristics of sintering of six kinds of iron ore powders on site，the mineral phase structure of the roasted samples is quantitatively studied，and the influence mechanism of various factors on the bonding phase strength is comprehensively analyzed. The results show that among the six kinds of iron ore powders，Newman powder is dominated by hematite，and the quartz mass fraction is 4. 1%. The iron concentrate is mainly magnetite，and the quartz mass fraction is 4. 9% ；The other four types are dominated by limonite，and the quartz mass fraction is 3. 1% ~ 5. 6% . The particle size distribution of each sample is not uniform，and the particle size of the super special powder is large，mainly concentrated in 5 ~ 10 mm. The domestic iron concentrate powder has the smallest particle size. The TFe mass fraction of the six kinds of iron ore powders is 56. 87% ~ 65. 62% ， among which the TFe content of super special powder is the lowest and the TFe content of domestic iron concentrate powder is the highest. The mass fraction of SiO₂ is 3. 33%~ 5. 90% ，and the SiO₂ content of super special powder is the highest，and the SiO₂ content of PB powder is the lowest. The metal phase in the roasted specimens is mainly hematite，and the binding phase is mainly calcium ferrite，among which the content of calcium ferrite is the largest in super powder and the content of hematite is the largest in wheat powder. The microstructures are dominated by melted interweaving structures，but the pore characteristics are obviously different，and the mackerel powder is mainly made up of thin-walled atmospheric pores，and the stomatal rate is the highest. The bonding phase strength of iron ore powder is positively correlated with the calcium ferrite content in the calcined samples，and negatively correlated with the content of hematite and porosity. It is closely related to the content of quartz and limonite in the raw materials，but the relationship with the content of TFe is not obvious. The research results have theoretical significance and application value for the rational utilization and optimization of sintering and blending of different types of iron ore powder.