In this paper, a reply network was constructed with the data downloaded from SINA BBS. Based on the complex network theory, we firstly studied the node closeness centrality and graph closeness centralization of the reply network, and analyzed the influence of the central figure in reply network by studying the node closeness centrality. The leadership of the central figure was proved through experimental validation method. Then the correlation of degree and average closeness centrality was discussed. Finally, a conclusion was drawn that degree and average closeness centrality are positive correlation. Experimental results indicated that degree centrality and closeness centrality were effective measure in studying the center position and function of the nodes in BBS reply networks.