[Objective] The agricultural water utilization efficiency of Jiangsu Province from 2002 to 2011 was investigated in order to provide the basis for improving the utilization efficiency of agricultural water resources in the province. [Methods] Both C²R and BC² models of data envelopment analysis(DEA) were used. The input indicators included crop planting area, farmland irrigation volume, water consumption of farmland irrigation and the numbers of employed staff engaging in agriculture. The output indicators included effective irrigation area, agricultural per capita income of rural resident, gross agricultural production and crop yield. [Results] (1) The agricultural water utilization efficiency of Jiangsu Province is at a higher level during the periods from 2002 to 2011, the effective years of DEA accounted for 50%. (2) Reasons were both technology and scale in the invalid years of DEA. The invalid years of DEA had shown the input redundancy and output deficiency. (3) With the development of times, the trend of input redundancy and output deficiency in agricultural water utilization is slowing down in Jiangsu Province. [Conclusion] The utilization of agricultural water resources in Jiangsu Province had been improved.