Abstract: In order to solve the problem of high quality and low utilization，and promote the high-val‐ ue development of resources，the geological characteristics and resource cascade utilization mode of dolo‐ mite in the Cambrian third to Furong Loushanguan Formation in Longgui Village，Xiuwen Country central Guizhou Province are studied. Through field geological mapping，microscopic lithofacies analysis，X-ray fluorescence spectroscopy and chemical titration test，the ore body morphology and ore composition are sys‐ tematically analyzed. The three-dimensional geological model is constructed，and the accurate positioning and grade discrimination of the ore body are realized by combining the rapid detection technology of spec‐ trum. Innovate the step-by-step layered mining process and establish the whole industrial chain technolo‐ gy system of 'exploration classification-echelon mining-deep processing'. The orebody is distributed in a monoclinic layered shape with a gentle occurrence. The ore is mainly composed of fine-grained dolomite， with mosaic structure and massive structure. Geochemical analysis shows that CaO is 29.99% on average， MgO is 21.32% on average，SiO2 is only 0.77%，and the harmful components P and S are lower than the in‐ dustrial limit. Based on the CaO-MgO content，a three-level classification system is established，com‐ bined with three-dimensional modeling and intelligent mining to achieve cascade utilization，and the re‐ source utilization rate is increased by 20%~30%. The dolomite of Loushanguan Formation in Longgui Vil‐ lage of Xiuwen County has the characteristics of high calcium and magnesium and low impurities，which is suitable for refractory materials and high-end building materials. The grading system and the whole indus‐ trial chain technology effectively support the strategy of“rich ore fine opening”，and promote the transfor‐ mation of resources from extensive development to green high-value through the cascade development mode of“special grade-metallurgical materials，primary grade-magnesium cement，secondary grade�building aggregate”，so as to provide a paradigm for the intensive development of minerals in Xiuwen area.

Key words: dolomite, geological characteristics, resource classification, rich ore fine opening