The typical sinter， pellets and lump ore were studied in this work， and the low temperature reduction deg- radation characteristics of different types of iron ores were tested and compared under the reducing gas conditions of two iron making processes. The results show that:① the degradation forms depend on the structure of iron ores. The lump ore and sinter both present the degradation of“cracking”， and the distribution of small grains generated from the cracking is in the range of 0.5 mm and 6.3 mm uniformly. Compared with lump ore and sinter， the pellets present the degradation of“surface stripping” and the RDI -0.5 of the pellets is the highest;②in the same condition of gas and temperature， for the degradation degree（RDI -3.15 ）， the sinter is the highest， the pellets are relatively lower and the lump ore is the lowest;③the temperature plays a important role in the low temperature reduction deg- radation of iron ores whose reduction degradation indexes（RDI） reach the peak at 550℃;④the low temperature reduction degradation degrees of iron ores are extended with adopting the hydrogen-enriched gas with high reduction potential， while the influence extent is discrepant for the different iron ore. Colligating the increase amplitude of grains in three small size fractions， the influence of the reducing gas on the lump ore is the biggest， and next come pellets， and the sensitivity of the sinter on the reducing gas properties change is relatively small.