Using the “3414” test design,the effects of N,P,K formula fertilization on the yield,sugar content and sugar yield of sugar beet were discussed,and the mixing ratio of NPK was optimized and analyzed by the fertilizer effect equation.The results showed that the yield,sugar content and sugar yield of sugar beet increased firstly and then decreased with the increase of NPK fertilizer,which was accorded with the law of diminishing returns for fertilizer.The effect of the different fertilizer on the yield and sugar yield of sugar beet was N＞P2O5＞K2O,and the effect on sugar content was K2O＞P2O5＞N.The fertilizer ratio of the treatment with all fertilizer(N 260 kg/hm2，P2O5130 kg/hm2，K2O 130 kg/hm2）was the best,and there were no significant differences with those in high N region,high P region and high K region.The ratio of output to input for all fertilizer area was relatively high,and got the highest yield of 47.13 t/hm2,the best planting benefit of 17 069.34 yuan/hm2,the highest sugar yield of 8108.8 t/hm2and the best enterprises benefit of 33 217.32 yuan/hm2.