Analysis of the formation mechanism and evolution of paleouplift could provide the basis for studying the inland tectonic movement. Besides, paleouplift is now an important hydrocarbon exploration targets. Seismic profiles, well data and outcrops of North Sichuan Basin indicate that the lack of upper parts of Xujiahe Formation in the study area was not because of the erosion caused by the movement of surrounding mountains, but because of the formation of a paleouplift, which we call JianGe Paleouplift. Since pinching out lines of strata caused by the formation of paleouplift can be treated as the boundary area of the high part of paleouplift, we certified the present spreading area of the paleouplift by studying the pinching out area of the Xujiahe Formation. By analyzing the time-strata relationship of seismic profiles and cross well lines, combined with Bischke Plot Analysis, we verified the formation and evolution history of the paleouplift. We also studied its formation mechanism by analyzing the regional tectonic evolution. JianGe Paleouplift spreads around Jiangyou, JianGe, Guangyuan and Wangcang, with its center in JianGe. It has undergone a complete uplift cycle. It began to form during the sedimentation of the third member of Xujiahe Foramtion, grew until the sedimentation of the sixth member and finally disappeared at the end of Early Jurassic, lasting about 21Ma, causing the sedimentation gap of about 350m. Because of the later alternation, the initial shape of the uplift does not exist now. The formation of the JianGe Paleouplift was controlled by the closing of the Mianlue Ocean. It constitutes the fore-bulge part of the Mianlue Foreland Basin. Its discovery is of great significance for analyzing the tectonic evolution history of northern margin of Yangtze Plate and for guiding the hydrocarbon exploration efforts of Xujiahe Formation in North Sichuan Basin.