Abstract: There is no significant follow-up breakthrough of exploration after the large scaled discovery has been gained in the Middle Jurassic Toutunhe formation of Well Shinan-21 in the hinterland of Junggar basin. Through the re-analysis on the reservoir of Toutunhe formation in Well Shinan-21, it is considered that transporting fault and lithology are 2 key factors constraining oil and gas exploration. Based on the detailed interpretation of newly-deployed high-precision 3D seismic data, the paper performs fine study of transporting fault and lithological targes and basically determines the distribution of 2 groups of transporting faults of 2 periods. Multiple periods of slope-break belts are discovered along the two flanks of Jidong swell and mudstone barrier is present in the up-dipping direction of the slope-break belts. Reservoirs formed in and separated by the underwater distributary channels. Controlled by the slope-break belts of 3 periods, multi-period overlapped sandbodies are developed in the eastern flank and match well with faults, resulting in large scale exploration in the future. The detailed characterization of lithological targets is carried out to provide basis for next drilling target determination.