Abstract: To provide an effective decision-making support for the enterpriseswhose functional departments are decentralized, a general model to describe the coordination process among functional departments of an enterprise was established based on the coordination theory and the structure of a distributed decision-making support system (DDSS) based on this model was designed. In this model, all functional departments of an enterprise are divided into a dominating department and non-dominating departments, and every department has the opportunity to become a dominating or non-dominating department. In addition, the information exchanged in the process of coordinating was definitely defined,i.e.the dominating department transfers the global decision vectortothe non-dominating departments, while the non-dominating departments transmit their marginal income vectors to the dominating department. Finally, the process of model solving was presented,i.e.limited times of department model solving and information exchanging.