The globalization of software development helps to reduce business cost by outsourcing software design and development tasks. However, it also poses new challenges on the collaboration and management of the development teams at multiple remote sites. Serviceoriented approaches facilitate web-based collaborations and reuses. In this paper, we propose a service-oriented architecture for the collaboration of software design teams in distributed locations. In particular, our approach allows different design teams from multiple remote sites to design software systems with design patterns, to evolve the designs, and to check the consistencies of the design evolutions. We provide service-oriented prototype tools for the design teams from different physical locations to model the software system designs in UML, to evolve the designs based on XSLT transformations, and to check the consistencies based on the Java Theorem Prover. A case study is presented to illustrate our approach.