The description of Extra-Functional Properties (EFPs) is a challenge in component research.The diversity of the EFPs and their relevance to other element of the system increase the difficulty of description.Meanwhile, it is not easy to guarantee the validity and accuracy of the attribute data.Taking the above issues into consideration, we resolved the element of component to decrease complexity of the system, and introduced a EFPs model, which is normative and uniform.The accuracy of the attribute data was increased through data refining, and the validity of the value was increased through values inherited.Finally, the method for selecting multiple attribute data was given with specific examples.