Aiming at the restraints in exploiting and utilizing the soil resource of tidal flat in the coastal region of North Jiangsu Province，the theory of ecological risk was introduced into soil salinization risk assessment of the agroecosystem of this area; methodology and procedure of ecological risk analysis was discussed; and an index system for soil salinization risk assessment was established and risk assessment models were constructed.Then the soil salinization risk of the region was quantitatively assessed and graded.Results show that the integrated risk value of the region ranged from 0.26 to 0.91 with an average of 0.53，indicating its soil salinization risk was generally high and varied significantly from place to place in the study area.The spatial pattern of the soil salinization risk was similar to that of soil salinity and groundwater mineralization.As affected by the farming system and field practices，the salinization risk was generally higher in the rice growing eastern part than the cotton-growing western part of the study zone.The area very high，high，medium，and low in risk accounted for 5.01%，63.54%，30.53%，and 0.92%，respectively，of the total study area.The two grades of high risk and medium risk were the largest in area and hence are the critical area for soil amelioration.The findings may be cited as reference for amelioration of moderate-and-low-yield farmlands and for scientific management of problem soils in the coastal region.