The lower Silurian is composed of grayish green sandstones and siltstones, which was turbidity in origin, forming in submarine fan. Using the LA ICP MS U Pb method, U Pb ages of detrital zircons from two sandstone samples were measured. 89 groups of U Pb effective age were yielded not only to constrain source area, the regional comparison but also to obtain tectonic evolution data in the Proterozoic and Paleozoic. The concordant ages of detrital zircons show that 689~836Ma magmatic rocks are mainly source area while 866~986Ma, 1055～1463Ma, and 1708～2490Ma rocks are secondary provenance. Normalized probability plots of Silurian sandstones indicate that magmatic activities are quiet in Early Silurian, and middle late Ordovician rocks were uplifted after early Silurian. Detrital zircons and CL images indicate that there occurred a large amount of magmatic rocks during the Neoproterozoic, related to South Tianshan Ocean subduction to the Tarim plate. Regional metamorphism developed within the area is referred from detrital zircon results.