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With the development of the Internet, social network has deeply rooted. People could construct more widely contact through social network. At the same time, social network analysis has made in-depth development; it has been widely used in modern sociology, anthropology, economics, and biology area. In social network, everyone has his wish to expand his circle of communication. But their energy of digging the potential friends by themselves is limited, so the link prediction which is one of sub-tasks of social network analysis becomes increasingly important. This article uses the AF model for link prediction to social network, Verify the correctness and validity of the method through the experiment on Enron's e-mail data collection.