The Gantaohe Group is one of the typical Precambrian strata located in North China Craton, mainly exposed in the northwestern Hebei Province. The paper reports the whole rock characteristics of geochemistry, zircon U Pb ages and Hf isotopic composition on clastic sedimentary rocks in the Nansi Formation, the Gantaohe Group. All samples have obvious negative Sr anomalies and depleted Nb, Ta, Zr and Hf. U Pb dates of detrital zircons yield three age populations of 1800 ~ 2400 Ma, 2400 ~ 2600 Ma and 2400 ~ 3100 Ma, respectively. The youngest detrital zircon age of the Nansi Formation of the Gantaohe Group is 1861 Ma. Combinning with the geological fact that overlying the Dongjiao Group formed after 1830 Ma, we can limit deposition timing of the Nansi Formation, the Gantaohe Group between 1861 Ma and 1830 Ma. All samples have about 2.5 Ga peak age, which is the intense tectonic magmatic thermal event recorded in the North China Craton’s Precambrian basement and proved that the North China Craton Precambrian basement is mainly composed of about 2.5 Ga rocks. The continental crust growth of the Trans North China Orogen crust mainly occurred in about 2.5 Ga, which is strongly related to the tectono magmatic event of the North China Craton during this period.