Paleoproterozoic Jinshuikou Group in the west of the West Qinling composed by serite-quartz schist、chlorite-sericite-quartz schist and biotite quartz schist , underwent greenschist facies metamorphism, which have a lot of debate about the deposition time and the tectonics property of metamorphic basement. With two schist samples of the Jinshuikou Group in Rouqigang area of Qinghai province as the research object，this paper used the LA-ICP-MS zircon U–Pb isotopic geochronologic methods to study the formation age，sedimentary source of Jinshuikou Group and metamorphic basement affinity. Detrital zircon U-Pb age spectrum of two schist samples can be divided into two major age spectrums of Neoproterozoic and Paleoproterozoic, and two minor age spectrum of Mesoproterozoic. Neoproterozoic age spectrums are group 688-908Ma and 711-841 Ma，with peak value of 788 Ma and 780 Ma； Paleoproterozoic age spectrums are group 1871-2174 Ma and 1832-2194 Ma, with peak value of 2140Ma and 2072Ma；Mesoproterozoic age spectrums are group 1520-1638 Ma and 1271-1276 Ma, with peak value of 1635 Ma and 1275 Ma.The age group information indicates that the sedimentary sources of Jinshuikou Group is much more complicated and characterized by obvious diversity. Its sources mainly might have come from the East Kunlun orogenic belt and the North Qaidam tectonic belt, and some from Yangtze plate, but without North China plate. More importantly, the U-Pb age spectrum of the schist`zircon highlight about the 780Ma age of Neoproterozoic, but without representative 1850Ma age and 2500Ma age of North China plate. In combination with regional data, the West Qinling basement, whose crystallization time is Early Neoproterozoic, is identical to the East kunlun block、the North Qaidam、Qilian block ,which all express tectonic affinity to Yangtze plate.