Abstract:For better development and utilization of kyanite mine in Yuji mountain Subei county, Process mineralogy study was carried out on the kyanite ore. the mineral composition, structure, mineral imbedding characteristics, the grain size and the dissociation degree of important minerals in the ore were basically found out by means of X-ray diffraction analysis, optical microscope, scanning electron microscope, X-ray energy spectrum analysis and automatic mineral analysis system (BPMA), And then The Mineralogy Factors Affecting Mineralization Indexes was discussed on account of the process mineralogy study,which not only provides the basis for the further processing and smelting of the mine, but also enriches the mineralogy data of the mine area.