In this paper, we undertook laser ablation- multicollector- inductively coupled plasma- mass spectrometer (LA- MC- ICP- MS) investigations on zircons for U- Pb geochronology, zircons in- situ Hf isotopic and whole- rock geochemical analysis on the Taohuagou dyke in Liangcheng, northern margin of the North China craton (NCC). Based on the newly obtained data, we identified the emplacement age, petrogenesis, and tectonic setting of the mafic dykes in Liangcheng and further discussed their implications for the reconstruction of the Rodinia supercontinent. The results show that the Taohuagou dyke was the product of mafic magmatism in the early Neoproterozoic (903±15 Ma), belonging to tholeiitic series, with high TFeO (12.78%~16.30%) and TiO2 (2.59%~3.31%) contents, and low MgO (2.87%~3.83%), Cr (32.7×10-6~42.0×10-6), Ni (11.6×10-6~14.5 ×10-6) contents, and low Mg# values (29~38). They are enriched in light rare earth elements (LREEs), Rb, Pb, Zr, and Hf elements, and depleted in Ba, Sr, Nb, Ta, Ti and Eu (Eu/Eu*=0.74~0.83) elements. The zircon in- situ εHf(t) of Taohuagou dyke ranges from 2.4 to 13.4, with single- stage Hf model (tDM1) ages ranging from 892 to 1357 Ma. The comprehensive study shows that the Taohuagou dyke in Liangcheng was formed in an intracontinental rift tectonic setting. The parent magma originated from the deep (~80 km) asthenospheric mantle, and pyroxenite components were involved in the source area. The magma experienced the fractional crystallization of olivine, clinopyroxene, plagioclase, Fe- Ti oxides and apatite, and was contaminated by the continental crust during emplacement. Geochemical data show that the early Neoproterozoic mafic magmatism in the NCC recorded the transition from intracontinental rifting to continental breakup. Geological and paleomagnetic data support that the NCC was adjacent to Laurentia in the early Neoproterozoic. However, further paleomagnetic research is needed to clarify whether it was adjacent to the So Francisco- Congo craton.