Based on Fauconnier's Conceptual Blending Theory and from the cognitive angle,this paper explains new metaphors such as virtual and real metaphor,mutual metaphor,conjectural metaphor,extended metaphor and so on in Fortress Besieged.The research reveals that different metaphors can establish different conceptual blending networks under conceptual blending frame so as to provide a set of new plan for us to analyze new metaphors in Chinese literature.