Abstract: In the complex, open and uncertain environments, all the decision-makers have to confront the problem of how to evaluate and select action plans. Decision support technology based on argumentation, which uses arguments to help to make decisions and explain reasons,is a new method that is different from traditional Decision support theory. Firstly we analysed drawbacks of current decision support model based on valucbased argumentation framework, and put forwad the theory of argument category. Secondly in the light of it we designed the Argumentation-Decision control- ling algorithm ArguDecision, and implemented Medicalcare-Decision support system called Smart Doctor to validate the feasibility and effectivity of this algorithm. Therefore we explored a decision support technique which intergrated the human thinking style of argumentation and logical laws, and carried out the whole the process of argumentation-decision usmg computer.

Key words: Valucbased argumentation framework, Decision support, Argument category, Action-argument, Evaluation argument