Based on GIS, the paper tries to be engaged in an analysis of the soil organic carbon density, storage and their spatial distribution in Haihe basin in accordance with the soil type and land use maps, for the study of the soil organic carbon density and storage spatial distribution is of great significance for the global climatic change. The results of our analysis have shown that: the range of the soil organic carbon density in the said basin stands between 1.62 and 49.49 kg/m~2 within 1 m layer. Seeing that its average density is 7.84 kg/m~2, it is below the national average level of 10.83 kg/m~2 and less than that of 16.13 kg/m~2 in China Northeast. There are 11 kinds ofsoil whose organic carbon densities are below the average density in the basin,and their area proportion is 55%. The soil organic carbon density in Haihe basin is quite different in space and has an increasing trend from the north to thesouth on the whole. The soil organic carbon storage in Haihe basin is about 2 481.94 Tg, with the highest organic carbon density in the cinnamon soil, which accounts for about one-third of the total of the basin. In addition, the organiccarbon storage of alluvial soil is 688.98 Tg, which constitutes not only the most widely distributed soil type but also the most important type of the farmingsoil in the basin. As a matter of fact, the main forms of land use in the basinare arable crop-fields, woodland and grassland, which account for about 94% ofthe total basin and their organic carbon density is below the national average level. The large area distribution of agricultural alluvial soil and the low rateof the mature forest and grass land should account for the low level of organiccarbon storage in Haihe basin. It is just for this reason that comes the need for proper estimation of carbon storage and feasible land use patterns in Haihe basin, which may help to relieve the likely greenhouse effect and in turn reducethe global carbon cycling.