Abstract: In order to study the relation between material accumulations and developing stages of litchee fruit, the dynamic change models of the accumulations, accumulative rate and accumulative acceleration of the fruit weight, pericarp weight, pulp weight, stone weight, fore-and-aft diameter and transverse diameter of fruit during development were established by polynomial regression and derivation calculus methods. Based on the models, the quality development law of litchee fruit was analyzed, which supply the theory evidence for taking appropriate measures to improve the yield and quality of ‘Jizuili’ fruits.