Abstract: The‘Dangshan Suli’pear fruits were treated with different colored fruit bags（eg. green，purple，red，orange and blue），which were made of different color filters. The fruit weight，content of fruit soluble solids，sugar，stone cells and mineral elements have been analyzed，in order to make a comparison of the effects of different light spectrum on the fruit quality. The results are as followings：(1) The fruits treated with green bags had the minimum stone cell content，reduced by 28.85% compared with the control group，and obtained the highest ratio of fresh weight to dry weight（3.54），and the content of Ca and Zn increased significantly（1.34 and 1.49 fold）；(2) For the fruits treated with purple bags，the soluble solids content has improved by 5.11% compared with the control，which is the highest of all the treatments，but the fruit shape index has decreased by 8.95%，which is the smallest of all the treatments. In addition，the ratio of fresh weight to dry weight increased by 9.38% compared with the control，but the stone cell content，total acid content and fruit hardness reduced by 22.83%，14.29% and 14.88%，respectively. Meanwhile，the content of Fe，Ca，K and Zn significantly increased by 1.09，1.26，1.24 and 1.40 fold compared with the control，respectively；(3) The weight and soluble sugar content of the fruits treated with red bags reduced by 7.33% and 31.27% compared with the control，whereas the content of Fe and Zn increased significantly（1.13 and 1.37 fold）；(4) The stone cell content of fruits treated with orange bags increased by 14.87%，which were the most of all the treatments；(5) The weight and soluble solids content of the fruits treated with blue bags decreased by 10.19% and 19.62% compared with the control，both of which were the minimum of all the treatments. Comprehensively，the purple bags can reduce the content of stone cell，and increase the soluble sugar content，the soluble solids and the contents of mineral elements of pear fruits，furthermore，the fruit hardness，the single fruit weight and fruit shape index are more ideal，thus the purple bags can be used to improve the‘Dangshan Suli’pear fruit quality.

Key words: pear, light quality, bagging, fruit quality