Abstract: In order to promote the popularization and application of the main stem-shaped pear tree in Xinjiang,the impact of different light conditions on fruit quality was comparatively analyzed by using the inner canopy shade fruits of Kurla fragrant pear,Yuluxiang pear and Xinli 7 pear and the external fruits with good light as the materials.The results showed that,compared with the canopy inner shade fruits,the external light of good Kurla fragrant pear,Yuluxiang pear and Xinli 7 pear fruit brightness value（L^*） were significantly increasedby 12.87%,7.24% and 6.02%.And the reddish greenness value（a^*） value were significantly increased by 62.88%,46.02% and 18.88%,respectively,indicating better color and redder color on the fruit surface.The weight and diameter of single fruit increased,but there was no significant difference.The total soluble sugar,soluble solid and chewability of fruit were significantly improved,and the quality indexes of sucrose,fructose,VC,hardness and organic acid were improved to some extent,but there was no significant difference.It can be seen that the fruit quality in the outer circumference of the tree is better than that in the inner chamber,so pruning should be strengthened to improve the light conditions of the fruit during production.