Such factors as detrital composition, major elements, trace elements and rare earth elements of sedimentary rocks can reflect the information of provenance, and are hence widely used to determine sedimentary provenance type and tectonic setting. An analysis of detrital petrology and geochemistry shows that the provenance of the basin around west Bogda came from the upper earth crust, and felsic rocks were predominant, with the mixture of a small portion of andsitic and basic rocks. The tectonic setting of this area should be active continental margin; nevertheless, as the original rock was formed in a continental island arc environment, a part of the tectonic background displays the continental arc environment. This research provides evidence for studying the structural evolution of the Chaiwopu Basin and North Tianshan Mountains, and is also of great significance for the exploration of oil and gas resources in Chaiwopu Basin and Junggar Basin.