Abstract: The Wutonggou formation of Upper Permian is one of the important hydrocarbon sequences in Jimusaer sag of Junggar basin, and the Wu?1member is the main oil producing zone. In this paper, five sand layers and sedimentary evolution laws of the Wu?1 memberwere studied for the purpose of the requirements of deepening petroleum exploration. The results show that there are several inherited braided river deltas developed in different stages of Wu?1member episode, and Ji?15well west and Jinan inherited braided river deltas as well as Beisantai swell southwest slope and Santai paleo?uplift small?scale fan deltas are identified for the first time. Along with lake extension, the inherited braided river deltas of Wu?1member moved away from the sedimentary center, which were favorable for formation of lithologic traps surrounding Jimusaer sag. The inherited braided river deltas developed in different stages have the retrograding contact relations among them, and the sand bodies of the lower sand layers are distributed in the central of the sag, while the sand bodies of the upper sand layers are distributed around the sag margin