| A mass of heterogeneous, distributed, and dynamic information on Internet has resulted in "information overload".With the flood of information, it has become an important research issue to provide users with effective service of resource discovery on Internet.Search engines attempt to solve this problem, yet the effect are far from satisfying. The agent mechanism of users about agricultural expert system on network was put forward according to the character that computer technology of agricultural users is weak in this dissertation. Its purpose is to construct the interesting model of a user by learning the interest of the user and observing his(her) behavior so that the service of individualized information inquiry will be offered. Firstly, the theories and technologies of Agent and multi-Agent have been introduced that Agent holds knowledge, methods of solving problems, relative data of problems, built-in controlling mechanism, individualized characteristics, study and adaptive capacity etc. Meanwhile, the application of Agent has many good characteristics such as self-determination, sociality, activity and reactivity etc. Agent technology derives from object-oriented technology, so that relation and difference must inevitably exist between of them. The new object-oriented language of Microsoft company--C# has been also presented. It not only inherits strong functions of C and C+ +, but also keep on being used briefly and easily as Visual Basic. It applies the tools and services that the frame of .NET provides for calculation and communication. With the help of the frame of Web services, network services may be looked on as the native objects of C#. C# includes the embedded pack model, supports the standard protocol of Web and at the same time it also supports XML Web Services which are transformed by any pack and can be transferred by the application of any platform through Internet. The meaning of this research is indicated by the general information of developed course of the personalized services. The interesting model of users is set up under the circumstance of users' participation. The algorithm of distilling personalized characters of users is ameliorated. The information source of agricultural Expert System on internet is searched initiatively, intelligently and cooperatively according to the need and taskmodel of users. The system can adapt the interest of users and the change of information source in its own way and satisfy users' demand of searching and tracking the information on the networks. Compared with current system, it has the features of adjusting to shifting user's interests and changing source adaptively, as well as personalized searching results. Integral designment of the system is provided in this paper. The system is separated into user Agent layout, information treatment Agent layout and information collection Agent layout, which follows the idea of delamination. The designment is propitious to the users to choose personal interface according to their interest, it also optimizes the sole Agent. Some Agents are designed and analyzed detailedly. Considering that agent theory is not very well-rounded, and also our level and condition is limited,many of the thesis is needed to study further.
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