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Although 3D engineering component models are becoming widely available due to the recent technological advancement and modeling tools, we lack engineering component models library service system where they can be searched and retrieved efficiently. This paper described the architecture and function modules of 3D engineering components library that enables users to navigate large sets of 3D engineering models. Critical service system issues such a representation of components, the similarity measure between two 3D models are addressed. We use feature vectors and parametric feature relation graph to abstract a large set of 3D models to a small set of representative models. The two-stage similarity assessment scheme that combines feature vectors and parametric feature relation graph graphs provides an indirect measure of similarity between 3D engineering models.