Software architecture is a new method in Software Engineering.It provides a higher framework for software reuse. This paper introduces the basic concept and research achievement of software architecture into the construction of enterprise information system and puts forward the software architecture model.It also gives a survey on the software engineering methodology and elucidates the significance of software architecture in context of software process. Then, a software architecture based model of enterprise information system domain is introduced,including software architecture model, reference requirement, reference architecture and so on. Thirdly, the software development process based on the model is described. Finally, some relative researches are discussed.