Abstract: To clarify the metallogenic regularity of tin-polymetallic deposits in the Dayishan area and to guide prospecting exploration, this study systematically investigates the ore-forming conditions and metallogenic patterns through field geological surveys, lithostratigraphic analysis, structural and magmatic rock characterization, and a synthesis of the spatiotemporal distribution and mineralization enrichment of the deposits. An ore-forming model is constructed and exploration targets are delineated. The results indicate that the Dayishan area is located at the composite intersection of multiple tectono-magmatic belts between the Xiangzhong Depression and the Nanling Uplift. Mineralization is significantly controlled by the NW-trending Dayishan-type faults. The ore-forming processes are closely associated with Middle–Late Jurassic magmatic emplacement. Spatially, three NW-trending mineralization belts (eastern, central, and western) are developed. Due to variations in stratigraphic, structural, and magmatic rock assemblages, different mineralization types are recognized in these belts, including granite-hosted, greisen vein-type, skarn-type, and hydrothermal filling-replacement types. The Devonian to Triassic carbonate rocks constitute the primary ore-hosting strata. The Dayishan-type fault system, the magmatic emplacement-related contact structural framework, and the apical protrusions of the pluton collectively form a composite ore-controlling system. The Jietou unit of the Tangshipu superunit (Yanshanian) is identified as the key ore-forming unit. Based on the established metallogenic regularity, an ore-forming model is constructed, characterized by "greisen-type mineralization within the pluton, skarn-type mineralization along the contact zone, and hydrothermal filling-type mineralization in the outer zone." The Xiaotang Pb-Zn prospect area in Guiyang County is delineated as an exploration target with considerable exploration potential. This study reveals the metallogenic regularity of tin-polymetallic deposits in the Dayishan area and provides a theoretical basis and practical reference for the exploration and research of similar tin-polymetallic deposits on the northern margin of the Nanling Metallogenic Belt.