Abstract: The mechanism of different positive ion and anion in reducing depth reduction temperature of iron oxide was studied by adding different fluxing agent such as CaCO₃、MgCO₃、Na₂CO₃、K₂CO₃、Li₂CO₃.The results show that the sequence of reducing temperature of positive ion was:K+>Na+>Li+>Ca²⁺>Mg²⁺.The sequence of reducing temperature of anion was:CO^2-₃ > F-> O^2->Cl^-.With the increase of reduction temperature,iron concentrate grade and recovery rate increases by addition of Na₂CO₃.But the dressing indext would be decreased because of the nepheline block layer which generated by too much feldspathoid when the temperature is too high.So the appropriate deep reduction temperature was 1050℃.It could be obtained that the iron concentrate grade is 93.03%,the recovery rate is 94.23%through the depth reduction test at this temperature.