Makes experimental study on Limonite's magnetic separation, roasting magnetic separation, gravitation separation and flotation. The results show that by strong magnetic separation process can obtain satisfactory limonite index. After optimized orthogonal experiment, the grade of limonite is increased from 32.91 % to 58.64 %, the recovery is 67.39 % and the productive rate is 51 % at one magnetic separation, and the grade of iron concentrate is 61.16 %, recovery is 67.39 % and productive rate is 36 % by magnetic roasting process. From aspects of economic and environmental protection, it is recommended to use strong magnetic separation.