Abstract: According to the outcrop survey and core observation, this study systematically analyzes the sedimentary characteristics and storm deposition model in Chang-8 oil layer, Yanchang Formation, Zhidan-Fuxian area, Ordos Basin. The analysis shows that the lithologies of tempestites are dominated by fine sandstone and argillaceous siltstone, and there are lacks of coarse grain sediments. The sedimentary structures of storm deposition mainly include the truncated structure, V-shaped mud-gravel, mudstone tearing debris, flushing surface, hummocky and swaley cross bedding, wave-ripple lamination, wavy cross bedding, penecontemporaneous structure, and etc. The storm deposition sequence has the characteristics of "Bouma-like sequence" in the vertical direction, which can be divided into five segments:the basal erosion structure (segment A), the parallel bedding (segment B), the hummocky and swaley cross bedding (segment C), wave-ripple lamination (segment D), wavy cross bedding (segment E) and mudstone (segment F) from bottom to top. The sedimentary sequences mainly consist of five types, thereinto type Ⅰ fully develops bedding structure (from segment A to segment F), type Ⅱ lacks the hummocky and swaley cross bedding, type Ⅲ lacks the parallel bedding, type Ⅳ lacks the basal erosion structure and parallel bedding, and type Ⅴ only develops wave-ripple lamination, wavy cross bedding and mudstone. The main provenance of the semi-deep lacustrine sediments in Zhidan-Fuxian area is derived from the northeast delta front. According to the sedimentary characteristics and transport distances of tempestite, the storm deposition developed in Zhidan-Fuxian area can be divided into proximal type and distal type. The discovery of storm deposition improves the understanding of sedimentary system in Zhidan-Fuxian area, provides a basis for the paleo-latitude and paleo-environment reconstruction and the stratigraphic division and correlation, develops a new idea for oil and gas exploration in Yanchang Formation, Zhidan-Fuxian area.