Abstract: Stipa grandis+Leymus chinensis grassland was analyzed for organic carbon storage and distribution in vegetation-soil systems under four different grazing degraded plots (CK:exclosed in 1979, GL:grazed lightly, GM:grazed moderately, GH:grazed heavily). The carbon storage in aboveground biomass was 42.63-203.16 g/m², in belowground biomass (0-40 cm) was 664.14-1 199.53 g/m², and the order in both was CK>GL>GM>GH. The total plant carbon storage in CK and GL were significantly higher (P<0.05) than in GM and GH. There was a significant positive correlation between the carbon storage in aboveground and belowground biomass. The carbon storage in the 0-100 cm soil depth among the different grazing degraded grasslands was 9.85-13.33 kg/m² and they were significantly different from each other in the order GM>GL>GH>CK. The carbon storage was significantly correlated with soil depth and was reduced with an increase of soil depth. The total carbon storage in the vegetation-soil system was 11.26-14.07 kg/m² and was significantly (P<0.05) different between the different grazing degraded grasslands in the order GM>GL>GH>CK. Grassland organic carbon was mostly stored in soil, which accounted for 88%-95% of the storage. There was no significant correlation between soil organic carbon and plant carbon. Moderate grazing can benefit the carbon sequestration function of grassland ecosystems.