Abstract: 【Objective】 To study the effect of increasing application of fulvic acid potassium dihydrogen phosphate water-soluble formula fertilizer on the growth and quality of Junzao jujube under the circumstance of reducing chemical fertilizer application in the hope of providing some scientific basis. 【Method】 With Junzao as the experimental material， a random block group experiment was adopted， and a total of 5 fertilization treatments were set up， and conventional fertilization was used as the control （CK）. 60 kg/667 m² （T₁）， 96 kg/667 m² （T₂）， 120 kg/667 m² （T₃）， 144 kg/667 m² （T₄）， the fertilizer reduction rates were 65%， 45%， 31%， and 17%， respectively. It was applied to the experimental plot 11 times by drip irrigation. During the fruit maturity period， the leaf length， leaf width， jujube hanging length， fruit shape index， fruit cracking rate， blackhead rate， fruit quality and yield were measured， and the application of different amounts of fulvic acid phosphoric acid was analyzed under the condition of reduced application of chemical fertilizers. Meanwhile， effects of potassium hydrogen water-soluble formula fertilizer on the growth and quality of Junzao jujube were studied. 【Result】 The test results showed that the leaf length and width of Junzao increased under T₄ treatment， and the length of jujube hangings increased significantly in T₃ and T₄ treatments. At the same time， compared with CK， T₃ treatment decreased by 45.78%， and T₄ treatment was significantly higher than that of CK. Compared with the control， the blackhead rate decreased by 69.50%； the T₄ treatment significantly increased the single fruit weight and yield， which were 18.87% and 13.62% higher than the control， respectively. Compared with the control， each treatment increased the VC content and reducing sugar content and the VC content of the T₂ treatment was similar. Compared with CK， it increased by 78.75%， and the total acid content in each treatment was significantly lower than that of the control. The total acid content of T₃ treatment decreased by 40.00% compared with CK， and the protein content of T₄ treatment was slightly increased compared with the control. 【Conclusion】 Comprehensive analysis in the treatment of 144 kg/667 m² of fulvic acid potassium dihydrogen phosphate water-soluble formula fertilizer （chemical fertilizer reduction rate of 17%） can significantly reduce the low fruit cracking rate and blackhead rate of Junzao， effectively promote its growth， thus improving yield and improve fruit quality； The optimum application rate of fulvic acid potassium dihydrogen phosphate water-soluble formula fertilizer in this experiment was 144 kg/667 m².