The study of sedimentary research is important to petroleum exploration, analysis of reservoir quality and tectonic evolution. Through core observing and describing of E2s3 in Shuangtaizi Structure Belt, colors of sediments were described. Sedimentary structures, such as erosion surface, grade bedding, massive bedding, penecontemporaneous deformation structures, were recognised. 3 types and 12 sub-types of lithofacies were builded. 4 kinds of facies sequences, including normal grading, inverse grading, normal-inverse grading and non-grading, were summarized. Base on these results, the main sedimentary facies of E2s3 in Shuangtaizi Structure Belt were middle sublacustrine fan, and slump. Genesis of sediment gravity flow depositions of E2s3 were episodicity flooding and earthquake, basing on the mud gravels with oxidation color and peneteconmporaneous deformation structures and combining the region tectonic evolution and paleoclimate. Tectonic, deposition, and climate co-controled forming and evolution of the sedimentary gravity flow of E2s3 in Shuangtaizi Structure Belt.