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Automated negotiation has become the core of the next generation dynamic trade method of e-commerce. The Agent plays a very important role in the construction of automated negotiation system. This paper focuses on agent's independent decision-making process; formally defines an abstract concept model for negotiating agent; then designs negotiating agent's architecture based on the concept model, which can support both goal-directed reasoning and reactive response; proposes an algorithm for running the decision making model. Finally, for illustration, the model is applied to an exemplified negotiation process for aircraft purchasing.