Abstract:The potential of oil and gas resources in the Meso-Neoproterozoic has attracted close attention of the international geological community. Proterozoic high-quality source rocks in other countries also developed in the North China craton basin in China at the same time, indicating that the Meso-Neoproterozoic in North China also has great exploration potential. This paper takes Meso-Neoproterozoic strata in Yanliao Aulacogen and Xiong’er Aulacogen of the north-eastern margin of North China Craton as the research object. Based on 6 field backbone profile measurements and 9 key auxiliary profile observations, the types and characteristics of Meso-Neoproterozoic sedimentary systems and the overall evolution of palaeogeographic environment in the typical aulacogens of North China Craton are systematically studied from the aspects of rock color, rock association type, rock structure, sedimentary structure and geochemistry. The results shows that: 1) the Meso-Neoproterozoic in the study area can be divided into seven sedimentary facies of barrier-type coastal facies, barrier-free coastal facies, neritic shelf facies, carbonate platform facies, biohermal facies, fan delta facies and glacial facies. According to its sedimentary characteristics, fifteen subfacies and twenty one microfacies are further divided. 2) The lithofacies and palaeogeographic characteristics in different periods of the study area are obviously different. In Mesoproterozoic, the study area sedimentary systems changed from clastic rock sedimentary system of the later Changcheng System to carbonate rock sedimentary system of the Jixian System, and then to the coexistence of clastic rock sedimentary system and carbonate rock sedimentary system of the early Daijian System. In Neoproterozoic, the study area changed from clastic rock sedimentary system of the Qingbaikou System to glacial-clastic rock sedimentary system of the Sinian System developed only in Xiong’er aulacogen, and the difference between north and south is obvious.