Abstract: In order to develop new methods in keeping fruits and vegetables freshness,methyl jasmonate treatment was used.The effects of different concentrations on the nutritional composition of fresh-cut crystal pear during room temperature storage were investigated.The results showed that the contents of titratable acid and reducing sugar decreased gradually,the contents of soluble protein,total sugar,Vc increased during earlier storage and decreased during the later storage,the rate of weight loss increased gradually with the storage.The above indexes changes in methyl jasmonate treated pears were less than that of the control.The titratable acid,soluble protein,reducing sugar,total sugar and Vc,were all higher,but weight loss was lower than the control.The effect of 1 μmol/L methyl jasmonate was better than that of 10 μmol/L.