Abstract: In the sintering process of iron ores, the fluidity of sintering liquid phase created by iron ores reacting with CaO is one of the important indexes that evaluate whether the sintering mixture can consolidate effectively. 10 kinds of imported iron ore fines were used to investigate the fluidity of liquid phase in iron ores and analyze its influential factors by the minitype sintering method and the viscosity evaluation method based on flow area. The effect of the fluidity of liquid phase in iron ores on the realistic sintering process was discussed. The results indicate that different iron ores have different fluidities of liquid phase in sintering conditions due to their inherent characteristics.