【Objective】There was evidence of large spatial variation in soil inorganic carbon (SIC) and complex relationship between SIC and soil organic carbon (SOC) in loess farmland of north China. This study aims to better understand the dynamics and driving factors of SIC in the North China Plain and Loess Plateau.【Method】Paired data of SOC and SIC were collected from each profile with a depth of at least 100 cm in the farmlands of North China Plain and Loess Plateau, which were published during 2000-2022. Regrouped data of SOC and SIC contents were obtained according to the distance between the profiles, and used to analyze the spatial distributions of SIC and SOC and SIC-SOC relationship.【Result】Mean SOC stock over 0-100 cm was similar between the North China Plain (6.5 ± 1.0 kg/m2) and the Loess Plateau (7.2 ± 2.1 kg/m2). Mean SIC stock was greater over 0-40 cm in the Loess Plateau (9.0±2.3 kg/m2) than in the North China Plain (6.1±1.6 kg/m2), but greater over 40-100 cm in the North China Plain (10.8±2.4 kg/m2) than in the Loess Plateau (8.3±4.2 kg/m2). Low levels of surface SIC in the North China Plain were found in Hebei Plain with long cultivation history whereas high levels of surface SIC in the Loess Plateau were mainly in the western section with strong erosion. There was a significant positive correlation between SIC and SOC stocks over 0-100 cm in the North China Plain (P<0.01), but a significant negative correlation in the Loess Plateau.【Conclusion】The dynamics of SIC in typical loess farmland is largely influenced by the regional environment and cultivation that affect the transformation and transportation of SIC. History of cultivation and hydrological processes associated with the Yellow River are responsible for the spatial distribution of SIC in the North China Plateau; Soil erosion-transportation-redeposition processes have large impacts on the variation of SIC in the Loess Plateau.