Abstract: This is an essay in the field of process mineralogy. A titanium magnetite ore in Yunnan not only has high iron and titanium, but also is associated with scandium. In order to realize the comprehensive utilization of the ore, the process mineralogy of the ore was studied. The chemical composition of the ore was identified by means of X-ray fluorescence spectroscopy and chemical analysis; The technological characteristics of the minerals were studied by means of X-ray diffraction (XRD), scanning electron microscopy and energy dispersive analysis (SEM-EDS), electron probe microanalysis (EPMA), and the occurrence state of scandium was emphatically investigated. The results show that the main carrier minerals of iron in ore are titanomagnetite and amphibole, followed by ilmenite; The carrier mineral of titanium is mainly ilmenite, with a small amount occurring in sphene; Scandium is mainly distributed in amphibole. The results of elemental distribution show that the theoretical grades of iron, titanium and scandium are 71.02%, 47.40% and 96.63 g/t respectively, and the theoretical recoveries are 40.52%, 66.48% and 97% respectively. The mineralogical factors affecting the recovery index of mineral processing are analyzed, which provides a theoretical support for the subsequent beneficiation and smelting process.