In this paper, we used the fruit flesh and pericarp of Citrus sinensis Osbeck cv. 'Anliu' and its mutant Red Anliu sweet orange as the experiment materials. The content of the major sugars and organic acids in the fruits were analyzed by gas chromatography (GC). We have surveyed the kinds of main sugars and organic acids, the content and the ratio of each component at five development stages of the fruit. To find the differences and correlations between the two materials, we have compared the content...