Abstract:In order to reveal the dynamic variation rule of nutrients and morphological index of chestnut, selecting 10-year-old fine chestnuts named bee ball in the southern area as research object, and establish the growth and development model of chestnuts by testing indexes, such as starch, reducing sugar, soluble sugar, protein, fat and longitudinal diameter, diameter, volume and weight during its growth. It is demonstrated that relation of fruit nutrients to growth days is in line with polynomial equation, and relation of fruit shape index growth days in line with Logistic equation. In the growing process of chestnut, the mutual transformation between the sugar and starch occur in the fruit. Furthermore, it is also found that both nutrient contents of fruit and fruit shape index show regular variations with significant correlation. These findings will be of great significance for scientifically forecasting and mastering the developmental level of the fruit in different periods, and can also provide a theoretical basis for strengthening scientific management.