This study examines the tectonic affinities and geochronology of three tectonic facies in the north Qinling orogenic belt, the volcanic rift or oceanic basin on the south margin of the north China block, early Paleozoic island arcbackarc basin assembledge, and late Palezoic island arcsubductionrelated opiolitic melange, respectively, using integrated field observations, biochronologic, geochemical, isotopic, SHRIMP and LAICPMs zircon UPb analyses. The results in the study show that transformation from seafloor spreading on the south margin of the north China block to subduction resulting in the arcbasin system occuured in the early Ordovician, ca 472±11 Ma, and there were two events of subductionaccretion orogeny developed in the north Qinling orogenic belt during the Paleozoic. Subduction migrated southward to the ocean from the early to late Paleozoic.