This paper introduces the concepts of Multi-agent system and presentsa Multi-agent system with control-agent. It also describes a model of Internet information retrieval and the realization method of the model. Finally an Internet comparation shopping application,WebDruid, is introduced.%介绍了Multi-Agent系统的概念，提出了具有Control-agent的Multi-agent系统，在此基础上分析了一种基于Multi-agent技术进行Internet信息下载和信息挖掘的模型及具体实现方法，并结合实际应用，介绍了可实现比较购物功能的WebDruid系统。
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