Abstract: ‘Red Fuji’apples were bagged with red-inner and black-inner gray-outer outer double-layer fruit bag at 25,35,45,55 days after full bloom. The results showed that bagging at earlier development stage had a trend to increase weight per fruit, decrease the soluble solid content, but less effects on firmness and titratable acid content. Compared with control(Non bagging), the bagging at different time had no marked different influence on flesh Ca, K content, expect that bagging at earlier development stage increased Mg content, reduced the ratio of Ca/Mg of flesh at maturity stage. And also, the fruits were covered with three different types of bags（White inner and gray-inner gray-outer outer double-layer，black inner and black-inner gray-outer outer double-layer and red-inner and black-inner gray-outer outer double-layer）at 35th day after full bloom，the weight per fruit increased and soluble solid content decreased, respectively, but the Ca content and Ca/K had not significant difference with control, but the Mg content was increased by red-inner and black-inner gray-outer outer double-layer bag, and also the K content by black inner and black-inner gray-outer outer double-layer bag, but Ca/Mg decreased by these bags. Expect of this, there are no significant difference among other treatments.