The Bengbu uplift, located in the southeastern margin of the North China Craton, experienced a more complex evolution process, in company with the collisions and stitching of the Yangtze platform and north China continental block. Authors collected seven samples from monzonite granite intrusions of late Early Cretaceous to conduct field observation and geochronological study. The ages obtained concentrate around 1146±33Ma~121±10Ma. Geochemical data show that the rocks are characterized by Siand alkalirich, calcium alkaline, weak Alsaturation, relative REE enrichment, weak negative Eu anomaly and no obivious Ce anomaly, distinct depletion of K, P an Ti, and relative enrichment of Rb, Ta, Sr and Nd, suggesting that the source rocks consisting mainly of continental crust experienced anatexis. K2ONa2O and SiO2Zr discrimination diagram shows that all points fall into Itype granite area. Epsilon Hf(t) values are all negative with relatively low values of -252~-1561, indicating its crustal origin. Two stages of Hf model age (217~276 Ga) suggests that the rocks sourced dominantly from NeoArchean continental crust material. Combined with the formation time of the North China Craton, this study concludes that magma source area was mainly lower crust material under the North China Craton. Crustal thickening and delamination of lower crust and lithosphere caused largescale magmatic activity. Partial melting of thicken lower crust resulted in rapid uplift of the earth’s crust and subsequent stretching. Modifying and recycling of the ancient continental crust material gave a rise to the formation of the monzonitic granite during late Early Cretaceous.