Objective The levels of oxygen in shallow waters and the atmosphere during the Mesoproterozoic period （approximately 1.8-1.0 Ga） have raised controversy. Currently， it is widely believed that there may have been fluctuating high and low oxygen levels at that time. However， the spatiotemporal heterogeneity of the ancient planet during this period limits our understanding of the redox state of the ancient oceans， but accumulated evidence tends to indicate dynamic fluctuations in the oxygen content of shallow seas. Methods This study， which focused on the carbonate strata of the Longjiayuan Formation in the Guandaokou Group， western Henan province （oldest age 1.59 Ga）， carried out petrological， elemental geochemical and C and O isotope geochemical analyses， mainly using Ce anomalies δ. Indicators such as δ¹³C and Y/Ho restored the redox state of the shallow sea in the region. Results Microscopically， the formation lithology consisted mainly of relatively pure fine-grained， powdery， and mud crystalline dolomite， with main structures containing different forms of laminated stones and siliceous bands. The main geochemical data indicated overall Th content <0.5 µg/g， Y/Ho > 26， ΣREE <12 µg/g， and Ce/Ce^*， Pr_（N）/Yb_（N） and Y/Ho. There was no significant correlation between ΣREE and Th concentration， indicating that the sample material was not affected by terrestrial debris interference to any great extent. Mn/Sr was generally low （average<6），δ¹⁸O>-10‰， and there was no significant correlation between Ce/Ce^*， Eu/Eu^* and Dy_（N）/Sm_（N）， indicating that the original seawater signal was relatively well preserved during diagenesis. The rare earth element distribution indicated significant negative Ce anomalies （0.53-0.94） and positive Y anomalies in the region around 1.54 Ga， similar to the value for modern seawater rare earth elements. This was accompanied by a significant increase in Y/Ho （mean 64）， followed by δ¹³C， which experienced a significant positive deviation and later recovered to the original level of the Mesoproterozoic era. Conclusions These findings indicated that there may have been a brief oxidation event in the region during the Mesoproterozoic. The range （0.53-0.94） and time （~1.54 Ga） of negative Ce anomalies in the Longjiayuan Formation were reasonably consistent with values in the second and third segments of the Gaogaozhuang Formation， and in the lower part of the Yangzhuang Formation. These indicated that the atmosphere and shallow sea environment in the North China Craton underwent an overall oxygenation process of common amplitude during this period. The negative Ce anomaly and its rapid rebound indicated that the low oxygen state in the shallow sea and atmosphere of the Mesoproterozoic continued to dominate， interspersed with a pulse-type oxygenation process that may have been widespread throughout the North China Craton at that time. This study provided direct evidence of pulse oxygenation events during the Mesoproterozoic， which was useful in determining the redox state of shallow waters during this period， and to explore the impact of oxygen level on the evolution of eukaryotes.