TTo disclose the effects of different tillage systems on the contents of soil organic carbon and aggregate properties, a field experiment was conducted in the costal saline soil region, Dongtai City of Jiangsu Province. Four tillage systems were adopted: conventional tillage (CT), deep tillage (DT), minimum tillage (MT) and no tillage (NT), soil organic carbon, bulk density and water-stable aggregates were measured. The results showed that compared with CT, NT treatment had significant effects on SOC content, the range was 18% – 32%. Water-state macro-aggregate contents of MT and NT were higher than other treatments by 10% – 31%, the MWD and GMD values of soil aggregates at 0 – 20 cm layer of MT and NT were significantly improved. Distribution of the soil organic carbon in aggregates was found to be that in aggregates varying from 0.5–1 mm to > 5 mm in particle size, the smaller the aggregates, the higher the soil organic carbon content therein.