With clastic rocks of the Lower Cretaceous Mogou Formation and the Pliocene Linxia Formation at Lintan area in the West Qinling orogenic belt as the study object, the authors used LA- ICP- MS zircon U- Pb isotope geochronological method to explore the provenance of Mogou Formation and Linxia Formation, which has important significance of study of Meso- Cenozoic tectonic evolution of the West Qinling orogenic belt. The results show that the detrital zircon ages are divided into 6 groups: (1)The Neoarchean- Paleoproterozoic (2627~1676 Ma); (2)The Mesoproterozoic (1487~1035 Ma); (3)The Neoproterozoic (996~812 Ma); (4)The Early Paleozoic (534~425 Ma); (5)The Late Paleozoic (409~252 Ma); (6)The Early Mesozoic (250~197 Ma), of which, the Neoarchean- Paleoproterozoic (2627~1676 Ma) ages data possess the largest proportion, accounting for about 5031% of the total data. The other ages possess a smaller proportion. The provenance source of Mogou Formation and Linxia Formation were much more complicated and characterized by obvious diversity. The Zircon age distribution of the two samples was consistent, with the Indosinian, Caledonian, and Neoproterozoic age peaks, as well as the unique peaks of 18 Ga and 25 Ga in the North China Block. The Lower Cretaceous Mogou Formation and the Pliocene Linxia Formation are characterized by proximal deposition. The Middle Qinling tectonic belt provides provenance, and the age patterns of the detrital zircon recorded the age information of multi- recycling zircons in the geological bodies of the provenance area.