Total of 2.7×10⁵hm⁵ of paddy fields had been converted after the implementations of the land arrangement and water-diversion projects in the west areas of Jilin Province.The severe drainage pollution featuring with the typical output pollutants such as TN,TP and T-S（Total Salts） has been exposed during the process of conversion of kaline soil into paddy fields.Based on continuous sampling and observation of drainage and soil of the typical pilot paddy fields in the area of Zhenlai County in 2010,the output concentration of TN,TP and T-S（Total Salts） and the net output load has been analyzed and estimated,respectively.The features of ions contents in paddy fields have been researched after the rice harvest and the research results were as follows: The concentrations of annual drainage in TN,TP and T-S（Total Salts） were 4.7 kg/hm²,0.29 kg/hm² and 3159.7 kg/hm²,respectively;the annual net output loads were 1.269×10⁵kg/hm²,0.783×10⁴ kg/hm²and 8.531×10⁷kg/hm².The major net output in drainage was large quantity of salt substance.