Abstract:The Rangjiaxi antimony deposit is located in the middle corner of the Xuefengshan arc structural belt. It is one of the typical antimony deposits in the structure of Xuefengshan arc Sb-Au-W metallogenic belt. The ore bearing strata are Sinian liuchapo formation and Cambrian xiaoyanxi formation. Based on the systematic summary of the regional metallogenic geological background and metallogenic law, through the analysis and study of the geological characteristics, ore body characteristics and ore controlling factors in the mining area, it is considered that the ore bodies are closely related to the lithology，strata and structure,the NEE-NE faults control the enrichment and mineralization of ore bodies.The wall rock alteration mainly includes silicification and pyritization.The type of Rangjiaxi deposit is medium and low temperature hydrothermal filling deposit. Combined with the latest exploration results in Rangjiaxi mining area,it is considered that there is a good prospecting potential in the deep side of the mining area.