According to current research, the differences of variety and content of carbohydrate in fruit mainly depended on the activities of sugar-metabolic enzymes (Yan 2009). Qi et al. (2006), taking Liaoyuanduoli (Solanum lycopersicon Mill) as a experimental material, found that the accumulation and metabolism of sugar in tomato fruit were controlled by SS and Inv activities, but not SPS. Similarly, Islam et al. (1996) indicated that AI and SS were involved in the sucrosemetabolism during tomato fruit development and the constant SPS activity was not required for sucrose accumulation. According to our research, the hexose content and invertase activity in Micro-Tom fruit had a significant positive correlation (Table 1)