Objetive: Bibliometric analysis of scientific research co authorship network from Spanish universities. Material and Methods: selection of documents from Science and Social Citation Index, from 2000 to 2004. The more important output data are analyzed applying social network analysis, and developing a bibliometric map that allows its visualization. Results: The Spanish intrasectorial university network it´s compound by the interconnection of sub-network of regional scope Conclusions: The research collaboration network between the Spanish universities constitutes a great component with absence of alternative components and/or isolated nodes. Spanish university research networks are geographically localized.