Abstract: To provide the best planting density system of Fuji grafted on Y-1 dwarfing interstock, in this study, 4-year-old Fuji apple trees as materials, three planting density system were 0.8×4m, 1×4m, 1.2×4m to analyze their effect on nutritional growth and fruit quality. The results showed, there were significant difference on tree height, trunk diameter between 0.8×4m and 1.2×4m(P＜0.05), but were not significant difference on tree crown, shoot growth and branch composition among three planting density system. The average daily photosynthetic rate of 1×4m was significant with the other two treatments (P<0.05), was higher than that of the other two planting density. The direct and indirect photosynthesis radiation increased with the decrease of planting density, but the leaf area index decreased, there was highest value on photosynthesis radiation of 1.2×4m, but lowest value on leaf area index. The single fruit weight, fruit shape index, soluble solids content, soluble total sugar content, hardness and sugar - acid ratio of 1×4m were significantly higher than those of the other two planting density, and the fruit quality was the best. Considering the growth potential of trees, light energy utilization, fruit quality and so on, it was the optimal system when the planting density was 1 × 4m for Fuji grafted on Y-1 dwarfing interstock.