In the automated command systems,the fixed structure model of decision-making organizations has such issues as multi-dimension,complexity,long exploiting cycle and huge costs.

Enterprise portal is a kind of Web technology of decision and collaboration, which has overcome the limitation of traditional decision support systems and met the needs of organizational decision because of its characteristics such as integrity, content management, personality and collaboration.

The cooperative engagement and it s the organization decision-making design is one of the task that has been researching in SOS counterwork project.

This paper first studies the complexities of organization decision making process and the emergent phenomenon in it, then analyses how emergent property influences the organization .

Based on the discussion of the characteristics of organizational decision-making, a process model of organizational decision-making was put forward.

This article discusses on the theory and approach of knowledge-management support of organizational decision-making from simply analyzing the current study situation in China and abroad, and on the construction frame of decision support system based on knowledge-management.