Abstract: According to the basic principles of outcrop sequence stratigraphy, the strata of Permian Longlinian-Lengwuan Stage in Yingen-Ejin Banner basin and its adjacent areas are divided into two third-order sequences through sequence interface identification and sequence classification. The sequence stratigraphic framework of the study area was established by comparing E-W-trending and N-S-trending sequence stratigraphic criteria. In Permian Longlinian-Luodianian Stage, the study area was of marine facies deposition through marine transgression, mainly developed offshore and neritic shelf facies sediments, and partly developed carbonatite plateau facies, with the development of transition facies sediments along the boundary of the basin. It had two depocenters. The depocenter of Heiyingshan-Ejin Banner depression was Biyunquannan-Lucaojing area, whereas the depocenter of Liuyuan-Badanjilin depression was Kalushan-Hangwula area. The study area inherited the sedimentary framework of the early Permian Xiangboan-Lengwuan Stage, only the deposition range shrank northwestward. The depocenter of Heiyingshan-Ejin Banner depression was Lucaojing area. The water body of Liuyuan-Badanjilin depression became shallow，and the depocenter was Gudongjing area.