Changes of main nutritive components and the macro-elements in both unbagged and bagged fruits of‘Ya li’pear were studies in this experiment.The results showed that starch,soluble sugar,reducing sugar,organic acid,Vitamin C changed in the same trend in unbagged and bagged fruits.The contents of starch,soluble sugar,reducing sugar,Vitamin C in the unbagged fruit were more than that of the bagged ones during the whole growth period,while the content of organic acid was in the opposite direction.Contents of N,P,K,Ca and Mg reduced gradually with the growing of fruits.The changes of contents of N,P,K,Ca and Mg in the bagged and unbagged fruits showed the same pattern.The contents of N,P,K,Ca and Mg in the unbagged fruits were approximately equal to those in the bagged ones.