Recent advances in Meso-Neoproterozoic chronostratigraphic research in China have yielded critical datasets and candidate sections for establishing standardized stratigraphic frameworks. This study presents new chronostratigraphic findings from the southern margin of the North China Craton. Zircon U-Pb dating reveals that tuff interbeds in the Longjiayuan Formation from Luonan County (1 526±16 Ma, MSWD=0.43, n= 8) and Qishan County (1 535±11 Ma, MSWD=0.68, n=12), Shaanxi Province, constrain these deposits to ca. 1.53~1.52 Ga. SHRIMP U-Pb ages of tuffaceous siltstone interbeds in the Duguan Formation further indicate an age older than 1 385±46 Ma (MSWD=1.07, n= 6). Integrating these results with prior studies, we propose a revised Mesoproterozoic chronostratigraphic framework for North China, addressing the stratigraphic void within the Unnamed System and advancing the standardization of the Qingbaikou System. High-precision tuff-zircon ages from the Luoyukou Formation, Longjiayuan Formation, and Duguan Formation enhance regional correlations between the Changcheng System and Jixian System, supporting their establishment as continuous, complete stratigraphic units and strong candidates for global geostratigraphic standards. Nevertheless, the discontinuous distribution of the Unnamed System and Qingbaikou System in North China, coupled with insufficient geochronological constraints, presents challenges for reconstructing the 1.3~0.8 Ga stratigraphic column and formalizing these systems as standardized geostratigraphic units in the near term.