This paper studied the soil N status in different paddy fields and the amount of used N fertilizer and its adjustment coefficient to reach rice yield target in Jiangxi province,in order to establish the recommended N fertilization system for rice in provincial area.Based on the data from 1 207 sites’ field “3414” experiment distributed in 88 counties for rice fertilization,and from collected soil and rice plant analyzed in laboratory,the correlation coefficients and regression equations was analyzed,respectively.The results showed that N had the significant effect for rice yield,and average per kilogram N increased the rice yield by 112 kg.But after the best amount of application,with the increase of N application content,the yield of rice increased,and the optimum fertilization treatment was N2P2K2.The correlation coefficients between soil available N and relative yield and between total N and relative yield were 0.591 5 and 0.233 2,respectively.Although both coefficients reached extremely significant level,the coefficient of available N was higher than that of total N.This indicated that soil available N was more capable of reflecting the ability of paddy soil N supply.The optimum N content for rice in different available N content was:the best N application was 175 kg/hm2,160 kg/hm2,150 kg/hm2 and 120 kg/hm2when soil available N content was 60 mg/kg,120 mg/kg,170 mg/kg and 250 mg/kg,respectively.According to the nitrogen application value under different soil available N content,and combination with the target yield method,the adjustment coefficient of nitrogen fertilizer application was 0.8,0.9,1.0,1.1 and 1.2 in different soil available N content,respectively.The recommended values of N application in different soil available N contents at 7 500 kg/hm2 and 9 000 kg/hm2 of target yield in Jiangxi province were calculated.