Because the number of web pages is sharply increasing, information searching and excavation have drawn people's increasing attention. However, besides some thematic information, there is also inappropriate noise information on the Web pages, so Web purification technology has become a concern for more and more researchers, and various algorithms have been proposed. This paper refers to the application of artificial immune system in the computer network intrusion detection and proposes a Web page de-noising algorithm based on the AIS. At the same time, this paper does non-linear study on the data anomaly recognition of the Web.