An experiment was organized to study the effects of nitrogen rates on production,quality and economic benefits of potato.The result showed that the highest yield was 24 030.7 kg/hm2 at N 180 kg/hm2,but the yield decreased obviously when N rates exceeded 180 kg/hm2.The relationship between potatoes yield and nitrogen rates was showed as:y=-0.083 5N2 +45.88N+17 333.9 (F=38.40**，R2=0.865**),and the optimum amount of N was 261.7 kg/hm2.The shoots growth,commodity potato rate were substantially increased at N 180~360 kg/hm2.The contents of starch,vitamin C and soluble sugar in potato tuber were increased at N 180~360 kg/hm2,and the minimum value occurred when N rate was 540 kg/hm2.The protein content peaked at N 360 kg/hm2,which was significantly higher than those of other treatments.The nitrate content was positively correlated with N rates (R2=0.969**).Nitrogen agronomy efficiency was higher at N 90 and 180 kg/hm2 compared with other treatments,though there was no obvious difference among them.Meanwhile,the highest net profit was 13 143.8 yuan/hm2 at N 180 kg/hm2.It suggested that N 180~261.7 kg/hm2 application on potato in Xiangyang City was advisable to attain high yield and profit.