Abstract: The paper aims to establish the evaluation method and classification standard of climatic quality, which provides a scientific basis for the evaluation of navel orange in the southern Jiangxi. With the sampling quality formation of the navel orange in the southern Jiangxi and the meteorological observation data, the effects of different climatic conditions on the navel orange quality were analyzed. The results showed that: the relative humidity and total precipitation from midsummer to early autumn showed a significant negative correlation with the soluble solids of the navel orange in the southern Jiangxi; the average temperature in the same period was positively correlated with the soluble solids content of navel orange, and negatively correlated with the content of acid; the positive correlation between air temperature and soluble solids content, negative correlation with acid content and positive correlation with the ratio of solid to acid were more significant in mature stage. Therefore, by constructing the comprehensive quality evaluation index of the navel orange in the southern Jiangxi, with total precipitation from July to October, the average temperature from September to November and the average relative humidity from mid October to mid November, the mathematical evaluation model of climatic quality of the navel orange in the southern Jiangxi is established, that determines the climatic quality level of navel orange.