Abstract: The Qushuikeng Sn ore deposit in the east of the Xikengjing tin ore field is tectonically located in the intersection between the eastern section of the Nanling E W-trending tectonic belt and the southern section of the Wuyishan NNE-trending tectonic belt. All this indicates its favorable geological condition. Based on the regional and ore deposit geology, this study classified the Qushuikeng Sn ore deposit into post-magmatic high and medium-temperature hydrothermal fissure filling-metasomatic type deposit. The formation of porphyritic biotite granite was followed by that ore-bearing hydrothermal fluids differentiating from magma migrated along the faults and fractures into favorable sections to form ore deposits. This study summarized prospecting criteria, such as magmatic rocks, structure, ore-bearing strata and country rocks, alteration, geochemistry, and gossan, and analyzed extension, thickness, grade variation and associated mineral resources, providing some references for seeking the deposits of the same type in this area.