Effects of naphthaleneacetic acid (NAA) on fruit quality of Jiefangzhong loquat were studied. NAA at different concentrations was sprayed at the full-bloom stage and young fruit stage, respectively. The results showed that the fruit quality was improved by spraying 20 mg/l naphthaleneacetic acid at full-bloom stage, and there was no significant effect on fruit quality when treated with 15-50 mg/l naphthaleneacetic acid at young fruit stage (when young fruits are bigger than peas). This may be related to the increase of indoleacetic acid and kinetin in the fruits when the young fruits pass the pea stage.