Neoproterozoic Jinningian deformed granites were recognized from the formerly-defined Alax Group. The ages of zircons from two deformed granite samples determined by step-evaporation technique are 971 Ma and 845 Ma, respectively, implying that they were formed by Jinningian magmatic event. The deformed granites are mainly augen gneisses, characterized by high content of SiO2, alkali(Na 2O+K 2O) and REE, low content of MgO, TFeO and CaO, K2O>Na2O, and intense negative Eu anomaly. Geochemical characteristics and tourmaline_ and muscovite-bearing rock associations suggest that Jinningian deformed granites in Alax area were formed in the syn-collisional setting. The discovery of Jinningia deformed granites demonstrates that magmatic activity of early Neoproterozoic affected the northwest margin of North China platform.