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In order to solve the lack of knowledge of the information security vulnerability analysis expert system, the dynamic cooperation mechanism that is based on the cooperation of data dictionary and knowledge base as well as relevant innovative techniques are put forward. Furthermore, the expert system based on the dynamic cooperation mechanism (ESDCM) is put forward to solve the information security vulnerability analysis problems. As the core of ESDCM, VA (vulnerability analysis) is made up of VAD-S (vulnerability analysis in data-dictionary) and VAK-S (vulnerability analysis in knowledge base). The paper introduced the process models of the VAD-S with the dynamic cooperation mechanism and the VAK-S based on data dictionary and knowledge base (DD-KB) mechanism; gave the comprehensive frame of ESDCM, discussed some subsystems and the dynamic knowledge base system of ESDCM; and finally proved the effectiveness and advantage of ESDCM. It is hopeful that ESDCM leads the expert system to a new stage.