Abstract: This paper deals with the effects of hydrological transfers, i.e., precipitation, irrigation, leaching and surface runoff, on the balance of nitrogen, phosphorus, potassium, calcium, magnesium and sulphur in the rice field ecosystm, cropped with wheat-rice rotation, in the Tai Lake region of Jiangsu Province. The results show-edi a. the sequence of the quantities of the nutrients transfered by hydrological pathway was in the order of Ca, Mg, S,K,N, and P.b.the capacities of calcium and magnesium in the soil nutrient pool were very significantly influenced by hydrological transfers, which resulted in the negative balance for these two elements, w-hile the effect on the capacities of nitrogen and potassium was rather small, the least effect was found in that of phosphorus, c. the contributions of hydrological input to the total input of calcium, magnesium and sulphur ranged from 50% to 88%) on the other hand, the.output contributions were from 73% to 94%. It could be concluded that hydrological transfers played a predominant role in the cycling of these three elements.