A amount of volcanic rocks named Bain〖AKu¨D〗yangpan Formation have been discovered in the Yinshan Mountains of the Inner Mongolian Plateau in the northern North China Craton. However, their formation age is ambiguous and debated, especially these in Zhuozi county, eastern Yinshan Mountains, have not even been reported before. The age of these volcanic rocks play a key role in establishing the stratigraphic sequence and understanding the stratigraphic correlation in Yinshan Mountains and Yanshan Mountains areas. We did detailed fieldwork on the volcanic rocks of the Bain〖AKu¨D〗yangpan Formation in Zhuozi county, which are charactered by typical bimodal volcanic rocks association. And Zircons from the rhyolitic tuff are dated by LAICPMS UPb method, which gave a weighted mean age of 136.9±0.8 Ma, representing the deposition age of the Bain〖AKu¨D〗yanpan Formation. Compared with the previous data form published articles, we found that the age of the Bain〖AKu¨D〗yangpan Formation volcanic rocks have evidently varied in both temporal and spatial, which should be two main period production of volcanic activities (approximately 137Ma and 115Ma, respectively). And those volcanic strata did not show the regularity that their age were older in the west Yinshan Mountains and became younger in the east Yinshan Mountains which previously supposed. Besides, this paper compared the age of the Early Cretaceous volcanic strata distributed in the Yinshan Mountains and Yanshan Mountains regions. The Bain〖AKu¨D〗yangpan Formation in the Zhuozi county and the Wulatezhongqi county correspond closely in age to the Zhangjiakou Formation in Yanshan Mountains, and the Bain〖AKu¨D〗yangpan Formation in the Wuchuan county and the Guyang county was correlated to the Jiufotang Formation in the YanLiao area(Yanshan Mountains—Western Liaoning area).