Abstract: In commercial production, the fruit yield of greenhouse tomato is the sum of all fruit trusses, and decided by the dry matte distribution to each fruit truss, studies each fruit truss dry matter production rule will to be helpful to understand the entire fruit dynamic production. In present study, a source-sink growth unit was adopted that was made up of a fruit truss and the three pieces of leaves just below the truss and its stem for understanding the fruit dry matter production. The results showed that: the leaf area index increased linearly up to 3.3 within the first three months after transplanting, and afterwards maintained about 2.6 with the balance of leaf pruning and leaf growing. The cumulated dry weight was divided into slow phase and quick phase obviously. At the end of 202 days growing, the dry matter production was accumulated about 1.6kg/m2. During fruiting period, the aboveground dry matter distributed to the fruit was accounted for 70%. For a source-sink growth unit, the distribution of the fruit dry matter is between 98% and 48%, with the decrease about 6% with increasing fruit truss number (the lowest fruit truss is the truss No.1), supposing the seven fruit trusses simultaneously existed in the same plant. This is probably related to fruit sink strength, when the ripe fruit was harvested, the distribution of the next fruit dry matter will increase. The ratio of dry matter distribution between the stems and the leaves was 3: 7 except for the 1st source-sink growth unit.