Abstract: This paper presents the sequence stratigraphic classification of single well of the Middle?Upper Permian in slope area surrounding Mahu sag of Junggar basin, and the sequence stratigraphic correlation of well logging and seismic profile, dividing the Xizijie formation,the Lower Wuerhe formation and the Upper Wuerhe formation into two second?order sequences and six third?order sequences, and recognizes the thick glutenite reservoirs of the middle?lower part of Xizijie formation, the lower and upper parts of Lower Wuerhe formation, and Upper Wuerhe formation, as well as three regional caprocks in the upper part of Xizijie formation, the middle part of Lower Wuerhe formation and the top of Upper Wuerhe formation, by which three favorable reservoir?caprock assemblages are given. The middle and lower assemblages are controlled by low stand system tract’s slope break belt, and dominated by lithologic and structural?lithologic reservoirs; the upper one is controlled by large?scale unconformities of the Permian-Triassic and the Lower Wuerhe formation-Upper Wuerhe formation,dominated by stratigraphic reservoir, and characterized by relatively shallow burial, matching well with oil source faults and high efficient petroleum transport system, it could be an important area for the recent hydrocarbon exploration