Abstract: In order to select the best plant growth regulators to improve the fruit quality of ‘Fuji’ apple. The ‘Fuji’ apple was used as the research materials in this experiment, sprayed 20, 60, 100 mg·L^-1 MeJA solution; 0.01 mol·L^-1 MDJ solution; 400, 500, 600 μmol·L^-1 ABA solution; 50, 100, 150 μmol·L^-1 ALA solution; 1 000 times and 1 500 times liquid of Guopenhong before picking, and sprayed water as control, the quality indexes of different treatments were measured and the principal component analysis method was used for comprehensive analysis.The results showed that compared with CK, the content of soluble solid substance, soluble sugar, carotenoids and single fruit weight in the fruit increased, and the soluble sugar content of T9 and the single fruit weight of T3 significantly increased by 43.18% and 28.88% respectively compared with CK; The content of titratable acid and chlorophyll were significantly reduced, and the content of chlorophyll of T9 was significantly decreased by 69.74% compared with CK; The values of color indexes L*, b* and h°were decreased, and b* and h°were significantly decreased by 18.97% and 19.20%, respectively; Both a * and C values were increased; There was no significant effect on fruit shape index and hardness. The comprehensive score of the principal component analysis ranged from high to low as: T9＞T7＞T8＞T1＞T11＞T10＞T12＞T5＞T6＞T4＞T3＞T2＞CK. It shows that T9 spraying 100 μmol·L^-1 ALA solution has the best effect on improving fruit quality of ‘Fuji’ apple, so it is the recommended plant growth regulator in production.