For decades, the 810~900 Ma 40Ar-39Ar Age of the glauconite from Jingeryu Formation has been used to establish the temporal-spatial framework of the Qingbaikouan，which occupies the upper part of the Tianjin Jizhou Middle and Upper Proterozoic Standard Section in the Yan-Liao Rift. Recent isotopic studies of Proterozoic and Neoproterozoic strata in the Yan-Liao Rift have yielded substantial constraints on the these strata ages, except for the Qingbaikouan which remains ambiguous. Several mafic sills intrude into the Jingeryu Formation were found in this research around Jiashan Town, Chengde City. These mafic sills demonstrate clear contact relationships with the host rocks, and the sequences under and above the host rocks are well-defined. A zircon U-Pb age of 1327±23Ma was obtained from one of these mafic sills. The finding confirms that the original Qingbaikouan in the Yan-Liao Rift predates the Yan-Liao Lips(~1320Ma). Consequently, similar to the Xiamaling Formation, the original Qingbaikouan—including the Longshan and Jingeryu Formations should be classified as early members of the Daijianian. There is No significant sedimentary gap exists between the Xiamaling Formation and the overlying strata. The Longshan and Jingeryu Formation will be placed at the lower part of Ectasian in the International Chronological Chart. Neoproterozoic Qingbaikouan are proved to be excluded from the strata sequences in the Yan-Liao Rift, The sedimentary interval from the Changzhougou Formation to Jingeryu Formation is constrained to 1670-1320 Ma.