Abstract:The trace elements are sensitive to the change of sedimentary background during the deposition period, making it possible to analysis the provenance and tectonic background, the sedimentary environment and the paleoclimate with the content and ratio. This paper has finished the restoration of Anjihaihe Formation in northwestern Junggar Basin, on the basis of the experiment test of trace and rare earth elements from 23 fine-grained samples and the sedimentary marks of cores and sections. The study indicates that: ①The provenance has experienced a strong weathering process and the acid felsic igneous rock formed in continental island arc are the main type of parent rock, with the help of REE/Chondrite patterns, upper mantle normalized trace element spider diagrams and the discrimination diagrams of Th/Sc-Zr/Sc, La/Yb-REE, La-Th-Sc and so on. The early Carboniferous intrusive rocks in Zaire Mountain are considered as the most probable provenance. ② The study area was in the continental brackish water of oxidizing environment during the Anjihaihe Formation period, using the characteristics of element combinations such as Li, Sr, Sr/Ba, Th/U and U/Th, δU, δCe, Ceanom, Ce/La, in agreement with the continental red beds deposite. ③ The evolution of Sr/Cu from the bottom to the top of the Anjihaihe Formation illustrates a process of climate change from damp-heat to dry-heat.