During the Internet-euphoria, business model has been en vogue, mainly in the domain of e-commence and e-business. Based on an extensive review of business model literature, the paper analyzes and defines software enterprise business model composition and construction for software development enterprise and software sales enterprise in light of SaaS-based idea, service profit chain theory and the four ??pillars?? framework. On the software industry chain, the software development enterprise should make devotion to application services by building business models suitable for enterprise resources, procedures and values, according to the technical development and user demand change; the software sales enterprise should devote to capture user's personalized demand to increase users' satisfaction for its core business based on the service chain theory.