Abstract: By means of comprehensive evaluation method, the characteristics of Carboniferous-Jurassic reservoirs and mantles in the North Dengdaohaizi-Wucaiwan Depression and Baijiahai convex slope zone of East Junggar Basin are evaluated. After the combination of the results longitudinally, several sets of reservoir and mantle assemblages are recognized. It is considered that the assemblages of M. U. J1s/L. J1s and U. J₁b^a/L. J₁b^a are most important, and the other assemblages are of secondary importance. Based on the distributive features of reservoir and mantle assemblages, the reservoir and mantle assemblages of the study area are predicted and evaluated on-plane.