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The study of crop potential model system based on knowledge model and componentware technology may effectively improve the independence of the model system and quantify crop potential. Firstly, based on the statistical models on crop potential output, the paper utilized knowledge model and componentware method to design the model system of crop potential output under distributed computing network environment. Secondly, the paper implemented crop potential model components at all levels by using componentware technology. Finally, with the abstraction mechanism of interface, the paper designed the potential interfaces and integrated all kinds of crop potential output models. The results show that as a component container about crop potential output model, the model system may integrate statistical models and mechanism models, and provide a dynamic management for crop potential output models and dynamic methods call. It solves the difficult issues such as integration and expansion, and provides technical support for analyzing and evaluating crop potential output.