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Assembly model is the key information applied in 3D design software. The information of the character, hierarchical and assembly relationship of assembly model are discussed. And the expression method of component information model and storage model are established. The relationship of the components should content not only the assembly information but also the function information in order to help the designers for problem solving. The mapping library for assembly relationship and function relationship is founded in order to support the component analysis. Knowledge model of the component is realized by object-oriented method. As an example, the function relationship of a tug-of-war robot is gotten based on the assembly model of it in Solidworks. The efficiency of the knowledge model for the inventive problem solving is illustrated.