General Integrated System Architecture is a set of models and methods that describes different aspects of the system and covers its life cycle. Its models are structuralized models with multi-layers and multiviews. They are descriptions and cognitions of the system at the top level and provide tools and methodology to understand, design, develop and implement the system. Therefore, they can supply references in enterprise diagnosis, business process reengineering and information system implementation. In order to meet the requirement in practicing enterprise information integration projects, this paper addresses General Integrated System Architecture and Description methods of its views. It also presents a framework and methods of the economic analysis based on enterprise modeling.