The Lanping sedimentary basin has experienced a five-stage evolution since the late Paleozoic:ocean-continent transformation(late Paleozoic to early mid-Triassic);intracontinental rift basin(late mid-Triassic to early Jurassic);down-warped basin(middle to late Jurassic);foreland basin(Cretaceous);and strike-slip basin(Cenozoic).Three major genetic types of Ag-Cu polymetallic ore deposits,including the reworked hydrothermal sedimentary,sedimentary-hydrothermally reworked and hydrothermal vein types,are considered to be the products of basin fluid activity at specific sedimentary-tectonic evolutionary stages.Tectonic differences of the different evolutionary stages resulted in considerable discrepancy in the mechanisms of formation-transportation,migration direction and emplacement processes of the basin fluids,thus causing differences in mineralization styles as well as in genetic types of ore deposit. The Lanping sedimentary basin has experienced a five-stage evolution since the late Paleozoic: ocean-continent transformation (late Paleozoic to early mid-Triassic); intracontinental rift basin (late mid-Triassic to early Jurassic); down-warped basin (middle to Lateral Jurassic; foreland basin (Cretaceous); and strike-slip basin (Cenozoic). Three major genetic types of Ag-Cu polymetallic ore deposits, including the reworked hydrothermal sedimentary, sedimentary-hydrothermally reworked and hydrothermal vein types, are considered to be the products of basin fluid activity at specific sedimentary-tectonic evolutionary stages. Tectonic differences of the different evolutionary stages resulted in considerable discrepancy in the mechanisms of formation-transportation, migration direction and emplacement processes of the basin fluids, thus causing differences in mineralization styles as well as in genetic types of ore deposit.