Qiangtang basin is a large marine basin formed in the Triassic and Jurossic Periods with abundant hydrocarbon source rocks and very complicated structures. Seismic reflection together with field geological mapping reveal well deep structures of the Qiangtang Basin in northern Tibetan Plateau. The Duoge Coren Thrust (DCT) and Armu Co Thrust (ACT) in the Northern Qiangtang Depression and the Xiaochaka-Shuanghu Thrust (XST) and Doma-Qixiang Co Thrust (DQT) in the Southern Qiangtang Depression mainly formed in upper Qiangtang Basin with depth less than 3km. The Longwei Co Thrust (LCT) and Northern Central Thrust (NCT) in the northern Qiangtang, Saibu Co-Zajia Zangbu Thrust (SZT) in the southern Qiangtang, and Northern Silin Co Thrust (NST) in the northern Lhasa Block formed in upper crust with depth larger than 6km. And the Northern Bottom Thrust (NBT), Southern Bottom Thrust (SBT) and Basement Thrust (BMT) formed below Triassic marine deposits of the Qiangtang Basin. Anticlines and synclines of different sizes formed widely along major thrust faults. Most thrust systems in Qiangtang Basin formed in Late Cretaceous, Paleocene-Early Eocene and Late Eocene-Oligocene. Fission track dating of apatites further indicate that uplift caused by regional thrust occurred in 87±5Ma~75±4Ma、64±5Ma~46±4Ma, respectively, during Late Cretaceous and Early Paleogene. Regional thrust and folding in Late Cretaceous-Early Tertiary leads to evident thickening of the Triassic and Jurassic marine strata and hydrocarbon source rocks, which provides favorite geological setting for hydrocarbon generation and oil-gas accumulation after intensive thrust stopped in Late Oligocene-Early Miocene. The Wananhu syncline, Baodaohu anticline, Donghu syncline and Armu Co syncline in the Northern Qiangtang Depression, together with the Ningri trap, Luxiongco anticline, the Norma trap, Xiede trap and Bengze Co trap as well as Triassic-Jurassic marine source rocks beneath thrust sheets of the Paleozoic basement rocks in Central Qiangtang Uplift and Paleocene-Oligocene lacustrine deposits beneath frontier thrust fault of the NST, are all important targets for oil-gas exploration in the Qiangtang Basin and its adjacent areas.