Abstract: The single fruit weight, the change of fruit length and diameter, the contents of main nutritional components, including organic acids, soluble sugar, vitamin C and so on ,were analyzed during the fruit development of two pear cultivars, including ‘Xinli No.7’ and ‘Zaosu pear’. The results showed that the change curve of single fruit weight in Zaosu pear and Xinli No.7 pear appear single "S" type of "slow-quick-slow" and the daily growth of fruit length and diameter present 3 peaks in Xinli No.7 pear, while the Zaosu pear has had 2 peaks. The content of soluble sugar is increasing constantly when organic acids and free amino acids are reduced gradually. The content of Vc and soluble protein change present the variation tendency of "drops-rises-drops".