Granites-syenites occurring in Jinzhai, Huoshan and Shucheng, western Anhui Province, have been studied by means of major element, REE and Sr, Nd and Pb isotopic methods. The results show that old crustal materials played an important role in their formation of these rocks are similar to that of the basement rocks of the North China plate. Therefore, the intrusions are located in the North China plate tectonically. Modes of occurrence, petrochemical features and emplacement ages of the intrusions indicate that they were formed in an extensional environment during the Cretaceous.