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Jurassic is the main source rocks of Qaidam Basin��distributed mainly in the northern margin of the basin�� Based on the comprehensive studies of marker beds��lithological features and sedimentary characteristics�� the alluvial fan facies��braided river facies��fan delta facies��braided river delta facies and lacustrine facies are distinguished in Jurassic deposits in the main sections exposed�� Both the facies belt distribution and paleogeographic evolution are closely related to the regional tectonic movement�� There are two evolution stages that include the faulted lake basin sedimentary stage from Early to Middle Jurassic and the depression lake basin sedimentary stage during Late Jurassic��according to the stratigraphic contact relations and sedimentary evolution��