Three-factor five-level quadratic regression was used to study the effects of different ratios of N, P and K fertilizers on the yield and quality of fifteen-year old Fuji apple trees in south Xinjiang. The results showed that the order of effects on yield were potassium > nitrogen > phosphorus and they were all positive. N and P, P and K were positively interacted, while N and K were negatively interacted. With apple production 4 325.18 kg/667m2 as the goal, the optimal combination of N, P and K were respectively 27.06 kg/667m2, 17.80 kg/667m2 and 2.06 kg/667m2. The influence on quality showed that high N can increase fruit weight but can not either improve its shape or enhance the accumulation of content in fruit. Appropriate P and K can improve fruit color, while too high or too low N can not improve fruit hardness. N and K can promote significantly sugar accumulation in fruit. Controlling P and N supplying can reduce the fruit acidity to some extent. High K treatment produce high Vc content.%以15 a生乔砧富士苹果树为试材,采用三因子五水平二次回归正交组合设计,研究了不同氮磷钾配比对苹果产量品质的影响.结果表明,不同肥料对苹果产量影响的顺序为钾＞氮＞磷,且都是正效应.氮与磷、磷与钾呈正交互作用,氮与钾为负交互作用.以苹果产量4 325.18 kg/667m2为目标,氮、磷、钾肥的最佳施用量分别为27.06 kg/667m2、17.80 kg/667m2、2.06 kg/667m2.高氮对增加果品重量有效果,却对改善果形无益,且不利于果实内含物的积累.适当增施磷、钾肥有利于改善果实的着色；氮素过高或过低都不利于提高果实硬度；氮和钾对促进苹果糖分的积累更为显著.减少磷、氮素供应可在一定程度上降低果实酸度.高钾处理比中、低钾处理的Vc含量更高.
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