Abstract: The mineralogical structure of Jidong magnetite pellets was systematically studied.The results indicated that main crystal phase of Jidong magnetite pellets was hematite,and both roasting and prehea-ting process imposed effect on the microscopic characteristics of the pellets.When preheat temperature is between 950℃ to 1 000℃ and the preheating time is 20 min,Fe₃O₄ in pellets has been substantially oxidized,and Fe₂O₃ significantly recrystallized and grain begun to gather.When the roasting temperature excesses 1 300℃ Fe₃O₄ in pellets began decomposition.,which implies suitable roasting temperature lower than 1 300℃.The combination of roasting temperature at 1 250~1 275℃ and roasting time longer than 20 min.produce Jidong pellets with compressive strength greater than 2 000 N per.pellet.