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In the 1940's, Paul proposed the concept of "opinion leader", and with the development of information technology and network, the importance of on-line community in information spread has become more and more greater. So the information analysis on Internet is becoming quite important. We construct the social network with the replying relations between comments mapped to the comment authors' relations. Then we validate its characteristics of small world networks and find out the opinion leaders in on-line community. Keywords: Opinion leader, on-line community, small-world network [ABSTRACT FROM AUTHOR]