We investigate and simulate the evolution process and topological features of the virtual community networks.We founded that the joint of nodes, joint of edges, networks’ degree distribution, average degree and the correlation between the node’s degree and its time in the network are different from the scale-free network model.With statistics and analysis of some of the characteristics of an actual Internet forum, we propose a new network evolution algorithm, namely the virtual community network construction algorithm.The simulation results show that the networks generated from our algorithm has the same characteristics as the real virtual community networks.