Internet makes it easier and faster to access to information, but because of the multitude of information onlineand continued rapid growth which the vast majority of users are independent, so how to find the information that they need in the network has become an important issue. Search engines are to some extent help people solve this problem, but it does not fully meet the needs of users. Based on this context,this paperdiscussed the Web data mining techniques and summarized its presentation, analyzed the current situation of Web information retrieval. For some shortcomings of Web information retrieval, this paper made a number of perspectives. This paper also introduces the data mining technology research which is applied to Web information retrieval and personalized search of online teaching resource library and improved the efficiency and quality of Web information retrieval.