To develop more powerful and flexible Organizational Decision Support Systems (ODSS), after the introduction of abstract architecture of a federated MAS system with two types of agent, the architecture of AODSS with three layers has been presented. The core layer includes two kinds of agencies: Application Agency for the common applications of this system, and Decision Agency for performing the actual decision activity and providing the results. To illustrate the architecture, a simulation work has been done in one Chinese TV company and the results imply that the architecture provides a very efficient method to design and develop ODSS for small & medium-size enterprise, in coordination mechanisms to ensure that organizational decision processes are optimized, information integrating of legacy systems for knowledge sharing, the interaction of multiple groups, flexibility and ability to extend and reengineer, the reusable ability of legacy systems, has played a very important role.