Abstract: The U-Pb dating of detrital zircons from three sandstone samples of the Shaximiao Formation reveals five age groups: 2660～2300 Ma, 1905～1738 Ma, 1690～1442 Ma, 866～811 Ma, and 298～160 Ma. By comparing the ages of zircons from different blocks (or bodies) in the surrounding areas and combining relevant regional geological data, it is found that the detrital zircons with ages of 2660～2300 Ma and 1905～1738 Ma are mainly from the southern Qinling orogenic belt and the northern margin of the Yangtze Plate, and slightly from the Bikou terrane and the Songpan-Ganzi terrane. Detrital zircons with ages of 1690～1442 Ma come from the Wuguan Group, the Wudang Group, and the Bikou complex. Detrital zircons with ages of 866～811 Ma are mainly derived from the northern margin of the Yangtze Craton, the Bikou Group, and the South Qinling orogenic belt. Detrital zircons with ages of 298～160 Ma mainly come from the South Qinling orogenic belt and the Late Triassic Songpan-Ganzi terrane. Evidences show that the sediment provenance of the Shaximiao Formation is mainly derived from the South Qinling orogenic belt and the Songpan-Ganzi fold belt, and partly from the Yangtze Craton. The uplift of the South Qinling ended before the sedimentation of the Shaximiao Formation, thus blocking the sediment input from the North Qinling and the south margin of the North China Plate.