本文对罗马尼亚东南部康斯坦萨高岭土矿床进行矿物学研究，该矿床在白垩系古海纳组地层中．经化学分析、Ｘ射线衍射分析、红外光谱分析、差热和电子显微镜扫描等研究，其矿物组成主要为结晶度差的高岭石、少量蒙脱石、伊利石及其混层矿物。铁和钛的有害组份较高。它的成因是由中酸性火成岩受风化作用，经剥蚀、搬运、在较稳定的沉积环境中．经过几次海浸沉积形成的。在沉积后，粘土矿物随着埋藏深度的加大，致使粘土矿物发生转化。 In this paper, the mineralogy of the Constance kaolin deposit in southeastern Romania is studied, which is in the Cretaceous Guhaina Formation. By chemical analysis, X-ray diffraction analysis, infrared spectroscopy, differential scanning calorimetry and electron microscopy studies, the main mineral composition of poorly crystallized kaolinite, a small amount of montmorillonite, illite and their mixed mineral. Iron and titanium harmful components higher. Its origin is caused by the weathering of moderate-acid igneous rocks, denudation, handling, in a more stable sedimentary environment. After several sea-water deposits formed. After the deposition, clay minerals with the burial depth increases, resulting in clay mineral conversion.