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The volume of junk emails on the Internet has grown tremendously in the past few years and is causing serious problems. So that we pay attention to anti-spam filtering technology research and development. By using data mining technology to spam effectively filter that effectively reducing the impact of spam on the user. For a large number of E-mail ID3 algorithms based on rule restriction in this paper, which through data mining techniques to filter out junk mail filter and applied to the mail system. In this paper, the Chinese e-mail subject and body text information will be filtered.