In Xikuangshan antimony ore field, the western fracture zone is a composite of major fault, F 75 , and its secondary faults, such as F 71 , F 72 and F 3 etc.. On plane, the fracture zone scatters from southwest to northeast, and concentrates from upper to deeper level on profile. All ore bodies exist in the carbonate of footwall of the major fault or that of the footwall of its secondary faults. From 480 m and 320 m to 120 m level, the fractal dimensional number of the fault system decreases from 1 482 2 and 1 448 6 to 1 339 2, which indicates the form of fracture zone becoming more simple at deeper level. And in five sub ranges, the Ⅲ and Ⅳ sub ranges are the known area, and the Ⅰ, Ⅱ and Ⅴ sub ranges are unknown. The fractal studies of the western fracture zone in these sub ranges show that the fractal dimensional numbers of the Ⅰ and Ⅱ, being 1 201 5 and 1 278 0, respectively, are smaller than that of the Ⅲ and Ⅳ, being 1 475 9 and 1 576 9, respectively; and that of the Ⅴ, being 1 571 2, keeps with that of the Ⅲ, Ⅳ sub ranges. So mineralization is not well in Ⅰ and Ⅱ sub ranges, and Ⅴ sub range is the best to benefit mineralization. In Xikuangshan antimony ore field, the western fracture zone is a composite of major fault, F 75, and its secondary faults, such as F 71, F 72 and F 3 etc .. On plane, the fracture zone scatters from southwest to northeast, and concentrates from upper to deeper level on profile. The All ore bodies exist in the carbonate of footwall of the major fault or that of the footwall of its secondary faults. From 480 m and 320 m to 120 m level, the fractal dimensional number of the fault system decreases from 1 482 2 and 1 448 6 to 1 339 2, which indicates the form of the fracture zone becomes more simple at deeper level. And in five sub ranges, the Ⅲ and Ⅳ sub ranges are the known area, and the I , Ⅱ and Ⅴ sub ranges are unknown. The fractal studies of the western fracture zone in these sub ranges show that the fractal dimensional numbers of the Ⅰ and Ⅱ, being 1 201 5 and 1 278 0, respectively, are smaller than that of the Ⅲ and Ⅳ, being 1 475 9 and 1 576 9 , respectively; and that of the Ⅴ, being 1 571 2, keeps with that of the Ⅲ, Ⅳ sub ranges. So mineralization is not well in Ⅰ and Ⅱ sub ranges, and Ⅴ sub range is the best to benefit mineralization.