Based on the study of outcrop sequence stratigraphy and sedimentology， according to the“single factor analysis and comprehensive mapping method”, various quantitative single factor maps and lithofacies paleogeography maps of the Buqu Age and Xiali Age of Jurassic in Qiangtang Basin have been compiled. The Buqu Age was dominated by carbonate rock deposit, and from north to south, the restricted platform (lagoon, tidal flat), open platform (platform basin, shallow beach, spot reef), platform edge shallow beach (or reef), platform foreslope, and deep sea basin were respectively developed. In the Xiali Age, the sediments were mainly terrigenous materials, deposited in the environments of lagoon, tidal flat, and shoreline and shelf. The marlite and micritic limestones of lagoon and platform basin facies are good source rocks, and the carbonate rocks of platform beach and edge reef facies are good reservoir rocks in the Buqu Formation.The mudstone and gypsum of lagoon and tidal flat facies in the overlying Xiali Formation are good seal rocks. The source-reservoir-seal combination above is mostly covered by the overlying Upper Jurassic, Cretaceous and Tertiary, and thus the Buqu Formation  is the best oil-gas exploration target strata in the Qiangtang Basin. The best oil-gas exploration belt is along both sides of the central upheaval belt and the belt from Pipa Lake to Bandaohu Lake.