This paper, we describe the application of a personalized interface agent for online book shops. Nowadays, due to the huge amount of information on different media, there is a serious overload problem. Users do have a lot of information but they do not have any tools that allow them to classify it and find what they exactly need. Agent technology can be used to overcome information overloading problem. Agents help the user to retrieve information from the World Wide Web. Agents is a software program that uses Artificial Intelligence. This system is intended to develop an interface agent that performs interaction between the user and online book shops. The system is also intended to develop a personalized agent that can perform searching, filtering and displaying customized information for each user autonomously.