Abstract: In order to meet customer demand on costime, The knowledge representation on coordination facing product lifecycle management demand flow chain based on costume enterprise is put forword. The forming of cooperating knowledge is analysed in PLM demand flow chain,and the cooperation knowledge is expressed in the whole demand flow chain through knowledge semantic. Finally, the prototype system of Cooperation Knowledge Representation System facing Requirement Flow Chain is developed. The system architecture, modeling technology and peration process is studied.The result objectively reveals that the study theory realises the knowledge management on cooperation mechanisms in PLM demand flow chain effectively,which improves the competence of costume enterprise.

Key words: product lifecycle management, demand flowchain, cooperation, knowledge representation, semantic description