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In order to provide techniques for digital design of the 3-D shape and visual simulating of tomato, on the foundation of observation, measurement and analysis of long term on tomato, the classification modeling of configuration of leaves and lateral branches was put forward based on measured data. Leaves and lateral branches were classified, and template libraries were constituted, which contains 2～4 temples respectively. Several principal control parameters with explicit biological background for these geometric models of organs were extracted based on the morphological features of tomato. Interactive designing the 3-D shape and organs of tomato were implemented by using template techniques. The models designed by this method, which presented polymorphism and have high realistic, could be integrated with agricultural knowledge easily. An interactive design software based on geometric model of tomato organs was exploited, by which users can design tomato plant model interactively. The digital model appears polymorphism, and ratios of model and real plant that the vertical projection leaf area and total leaf area were compared, they were 0.4788 and 0.4832, respectively, the error between them was 0.91%, so it has a high sense of reality.