Abstract: The World Wide Web serves as huge, widely distributed, global information service center for various applications. Web contains a rich and dynamic collection of hyperlink information and Web page access and usage information, providing rich sources for data mining. The goal of Web mining is to discover the access pattern and hidden information from the huge collection of documents plus hyperlink information, access and usage information. Given in this paper is an overview of Web mining techniques and new trends, mainly involving Web structure mining, a multilayered Web information base building, and Web Log mining.