Abstract: [Objective] The purpose of this experiment is to measure trace mineral concentrations in the leaves of high, medium, and low yielding'Korla fragrant pear'trees at different times during the growing season.The results can be used as a reference for fertilizing pear orchards.[Method]Trace mineral concentrations were measured at different times during the growing season.Leaves were collected from Korla fragrant pear trees every two weeks from April 28 until September 23.The'Korla fragrant pear'trees were 20 to 25 years old.[Result]Leaf Fe, Cu, Zn, and B concentrations decreased during the growing season, whereas Mn and Na concentrations increased.Averaged across the growing season, leaf Fe, B, and Na concentrations were greater in high-yielding orchards than in medium-and low-yielding orchards.Leaf Cu concentrations were greatest in medium-yielding orchards.Leaf Zn and Mn concentrations were greater in the low-yielding orchards than in the medium-and high-yielding orchards.Correlation analysis showed that leaf Zn concentrations were significantly positively correlated with leaf Fe and Cu concentrations.Leaf Mn concentrations were significantly negatively correlated with leaf Cu, B, and Na concentrations.Correlation analysis also indicated that high yield was significantly positively correlated with leaf Fe concentrations on July 13, September 23, and July 28.High yield was significantly negatively correlated with leaf Cu concentrations on September 10 and with leaf Na concentrations on August 10.[Conclusion]The trees should be supplied with Cu during the early growing season.Iron should be supplied during the mid-growing season.Zinc should be supplied during the mid and late growing season.Boron should be supplied during the entire production period.Supplementation with Mn and Na is not recommended.In conclusion, the yield and quality of'Korla fragrant pear'can be increased by understanding the correlation between yield and leaf trace mineral concentrations at different times during the annual production period.