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The contribution of knowledge management to the process of decision making has been largely ignored by researchers from the fields of both decision theories and knowledge management. Firstly this paper highlights the importance of organizational decision knowledge system. Then decision makerpsilas learning behaviors and the mechanism of knowledge intervention have been analyzed and introduced. Thirdly this paper discusses the concept of total decision support (TDS) for improving the effect of decision making and compares total decision support and traditional decision support system (DSS) from several aspects. Based on the above analysis we put forward the research framework of total decision support and point out the future work.