Based on the modern sedimentology theory, the lithofacies types, lithofacies combinations and sedimentary characteristics of Yan10 in Yan 'an Formation are studied in detail by means of field observation of braided river outcrop section and drilling data, and the sedimentary facies, microfacies and sedimentary model in the study area are discussed. The results show that four lithofacies types are developed in Yan10 Formation in the study area: coarse sandstone facies (St) in trough cross-bedding, tabular cross-bedding sandstone facies (Sp), parallel bedding sandstone facies (Sh), massive structural sandstone facies (Sm) and braided river lithofacies association. In addition, braided river sedimentary facies, heart bank and flood plain sedimentary microfacies are identified. The research results have certain guiding significance for the Yan 'an Formation braided river lithofacies association and sedimentary facies, and could provide reference for other layers of braided river deposition in Ordos Basin.