Abstract: Industry Fundamental Classes(IFC) standard is made for defining the building information model of the whole building life circle progress.It's a necessary but not sufficient condition.NBIMuses the use-case to define the data requirement of information exchange among different engineer work flows precisely.The exchange information in the workflow is defined by Exchange Models(EM), and the EM is formed by the Exchange Objects(EO).Before we define the exchange compile model view of the product model data for different BIMapplication tools, we must confirm the semantics scope of engineer, construction, products, and embed into EO, conforms the Semantics Exchange Object(SEO) for a more precise result.