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富士苹果树冠不同层次、部位相对光照度和果实品质分析表明，相对光照度从树冠上层到下层、外围到内膛逐渐降低，果实品质差异明显；应用一元二次回归建立相对光照度对富士苹果品质因素影响的回归方程，求解出果实品质指标最大的相对光照度，果实花青素含量对光的要求较高，相对光照度７７．９１％为富士苹果花青素形成的最佳相对光照度，果实可溶性固形物和总糖的最适相对光照度为６０％，其它各品质因素对相对光照度要求较低，但均在５２％以上。
The relative illumination and the fruit quality of Fuji apple tree canopy at different levels showed that the relative illuminance decreased from the canopy to the lower layer and the periphery to the boreholes decreased obviously and the fruit quality was obviously different. The application of quadratic regression to establish the relative illuminance on the quality factor of Fuji apple Regression equation to solve the maximum relative light intensity of fruit quality indicators, fruit anthocyanin content of light higher, the relative light intensity of 77.91% for the Fuji apple anthocyanin formation of the optimal relative illuminance, fruit soluble solids and total The optimum relative illuminance of sugar is 60%, and other quality factors have lower requirements for relative illuminance, but both are above 52%.