Software architecture style is important in the software architecture area. It restrains the system's activities in life cycle and improves the system's reuse level. This paper proposes a mixed architecture style－RROS (Rich Representational Orthogonal Service) which is more suitable for WEB environment based on the existing style. This style of WEB application system can be used as reference for the development and to guide the design, definition and deployment of WEB application system. The paper demonstrates the value of its practical application to the CKM (Customer Knowledge Management) system.