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Citation semantic link network is combination of semantic link network and citation network, which make citation network has the abilities of semantic representation and semantic reasoning. According to semantic reasoning rules, we can get the implicit citation semantic link in network and the new semantic relations between citations. It provides a more efficient method for the citation network retrieval and the complex network theory. Based on citation semantic link network scheme, this paper proposes a method to calculate the similarity of citation semantic link network. This method is the key to discover community in citation semantic link network. Using this similarity calculation method, we can discover semantic community of various research fields in citation network, and foresee developing directions and hot spots of various research fields.