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With the widespread use of broadband network, the firewall, as a filter installed on the border of network, can easily cause congestion and becomes the bottleneck of network transmission. The Web Monitoring System Based on the URL Analysis introduced in this paper replicates the user Web request by the use of the monitoring technology, extracts and analyzes the URL of user request. Then the URL will be matched in the blacklist database by utilizing a fast matching algorithm and a decision whether to intercept the user request will be given. If the URL is illegal, the user request will be redirected and the connection between the user and the harmful web site will be disconnected. This system has solved the problem forbidding the user accessing to the network illegally with no affect on network transmission.