In view of the current situation of blind fertilization in the growth process of cut herbaceous peony（Paeonia lactiflora Pall.），‘Xiangtiange’herbaceous peony was taken as the test material，the experimental fertilization scheme of“3414”was adopted，and the membership function method was used to study the effects of different amounts of nitrogen （N），phosphorus（P）and potassium（K）fertilizer on the growth of herbaceous peony，and the appropriate fertilizer amount for the production of cut herbaceous peony. The results showed that different fertilization treatments had significant effects on plant height，stem diameter，bud diameter，plant number and cut flower number（P ＜ 0.05）. The comprehensive membership function value of N and P deficiency plots were less than that of no fertilizer plot，the K deficiency plot was greater than that of no fertilizer plot，and the effect on the growth of herbaceous peony was N ＞ P ＞ K. The comprehensive membership function value of N₂P₂K₁ treatment was the largest，which was 0.61，and the growth of herbaceous peony plants was the best. The comprehensive membership function value and fertilizer application rate of each treatment were simulated and analyzed by fertilizer effect functions. The fitting correlation of quadratic and binary quadratic fertilizer effect function equations reached a significant level. The ternary quadratic fertilizer effect equation was an atypical model，and the frequency analysis method was used to calculate the recommended amount of fertilizer. Based on the comprehensive analysis of the recommended dosage of each fertilizer effect function equation and the corresponding comprehensive membership function value，the recommended fertilization amount of cut herbaceous peony in this experiment was N 212.7 kg/hm² ，P₂O₅ 46.2 kg/hm² ，K₂O 49.9 kg/hm² ，and the fertilization ratio was 1∶0.21∶0.23. It could be used as a fertilization reference for the production of cut herbaceous peony in this experimental area.