Abstract: The sticking of iron ore powder restricts the reduction of iron ore in fludized bed.The effects of sticking prevention by adding inert material into fludized bed,and the relationship between defluidization and composition and size of iron ore,reduction temperature and atmosphere,metallization rate,and kinds and quantity of inert material etc.are probed into through experiment in this paper.Then the mechanism of sticking is discussed.MgO is the best additive for sticking prevention with an adding amount below 5%;CaO comes second with the adding amount of 5%¹0%.Small amount of coke powder,dolomite,and CaCO3 has little effect on sticking prevention.The lower melting point,the smaller size,and the higher metallization rate and temperature the iron ore powder has,the easier it becomes defluidized.