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A new model of decision support system is presented in this paper. The system is designed in four layers structure and is based on three library. Firstly, we analysis the existing problem of the efficiency and expandability of the system. Then, we study the knowledge management and the B/S model based on Web technology. Based on this, the paper gives the model of the decision support system based on knowledge management and web technology. And the paper also describes the system structure and gives the detailed steps of decision-making process.