The quality of sinter is closely related to the high temperature performance of iron ore powder. Adding metallurgical dust in the sintering process is important for iron and steel enterprises to deal with metallurgical dust, which will inevitably affect the high temperature performance of iron ore powder, and then the quality of sinter. Therefore, it is of great significance to study the influence of metallurgical dust on the high temperature performance of iron ore powder. The physical and chemical properties of 3 metallurgical dusts ( sintering dust,blast-furnace dust and sintering miscellaneous material) and iron ore powder are compared,and the effects of metallurgical dust on the assimilation and liquid phase flow of mixed iron ore powder are studied by micro-sintering experiment. The results show that the particle sizes of sintering dust,blast-furnace dust and sintering miscellaneous materials are smaller than those of mixed ore,and the particle size of sintering dust is the smallest. Increasing the ratio of sintering dust,blast-furnace dust and sintering miscellaneous material will reduce the minimum assimilation temperature and bonding strength of mixed ore,and improve the fluidity of mixed ore. The miscellaneous materials have the greatest influence on the decrease of minimum assimilation temperature,and the blast-furnace dust has the greatest increase on the fluidity index. The effects of 3 kinds of metallurgical dust on the bond strength of mixed iron ore powder are similar.