Abstract: This paper studies the growth curve and content variation of suger, titratable acid and Vitamine C, which in the two main wampee cultivars ( Clausena lansium (Lour.) Skeels cv. ‘Jixin’ and Clausena lansium (Lour.) Skeels cv. ‘Yunan seedless’ ) during the process of fruit development. The results showed that the growth curve of fruit vertical diameter and transverse diameter were all a double sigmoid curve . Although the contents of sugar, acid and Vitamin C in the two cultivars of wampee follow a contain variation pattern, with the fruit ripening changed regularly, they all have a significant correlation with the growing period during fruit development. The total soluble sugar gradually increased as fruit ripened, and leaped in the 12th week after full bloom in ‘Jixin’ wampee while in 14th week in‘Yunan seedless’wampee. The titratable acid gradually decreased during the fruit development, and decreased sharply in the late stage of fruit full maturity. i.e. in the 12th week after full bloom in ‘Jixin’ wampee while in 13th week in ‘Yunan seedless’wampee. The content of Vitamine C went up and down in the early stage of fruit maturity, but increased sharply in the late stage of fruit full maturity. Finally, the content of Vitamine C in the ripen fruits is higher than the green ones.