Abstract: The Linxi Formation in central Greater Khingan Mountains is an important hydrocarbon source rocks strata. The formation of hydrocarbon source rocks is closely related to the paleoclimate, palaeostructure and palaeo-environment during the propagation and burial of hydrocarbon generation parent organisms. The climatic tectonic environment of Linxi Formation in sedimentary period can be restored through the geochemical analysis of rock data. Based on the Sr, Li and Ga content, the Sr/Ba ratio, the U/Th ratio and δU method, the Sr/Cu ratio, the authors in this paper have analyzed the sedimentary environment of Linxi Formation from the ancient salinity, re-dox environment, and the ancient climate. The results show that the Linxi Formation might be formed by resedimentation after middle-strong weathering. The oxidative deposition environment is freshwater-brackish water, and the paleoclimate is warm humid climate. The Al₂O₃/(Al₂O₃+Fe₂O₃) and K₂O/Na₂O- SiO₂ ratios, the content and parameters of rare earth elements were used to indicate the sedimentary environment of Linxi Formation. The results show that the Linxi Formation was formed in the active continental margin tectonic environment near the continental island arc, and the paleoenvironment evolved from the sea-land excessive brackish water to the continental freshwater environment in the early retroarc basin. The Linxi Formation is favorable for enrichment and preservation of organic matter, which is the beneficial horizon for hydrocarbon source rocks.This study can provide guidance for the esploration of hydrocarbon source roaks in this area.