Widely applied in OA (Office Automation) systems, workflow technology is faced with challenges of diversity and volatility. In view of this, we found that the diverse and volatile work flows are mainly caused by the coordination among departments and individuals instead of single procedure change. On this basis, we present a scalable workflow system based on procedure profiling. First, the functionalities of OA system are split and mapped to different atomic units according to the functions of different departments. Second, to satisfy the requirements of inter-departmental collaboration and continuous updates for workflows, a workflow is combined with atomic steps within the jurisdiction of each department. The system retains usability and scalability characteristics.