With the increasingly wide range of Internet applications, Internet behavior monitoring aroused widespread concern. With BHO hijacking techniques to build an efficient monitoring system, not only can achieve real-time monitoring online behavior, but also has a lightweight characteristics, not only that, but also be able to effectively shield the site or filtered, to avoid unauthorized users from bad web , but also effectively prevent the illegal intrusion of the Web page. In the system design process, the application, the application of advanced signal report have both modular design strategy, so that the system has relatively broad applicability and can be private users, the user unit may be, in addition, the system In the communication efficiency is relatively good. In short, the Internet behavior of the monitoring system has won the people's widespread recognition.