摘要： 介绍了最新被应用于信息检索领域的模型——语言模型。论述了构造应用于信息检索语言模型的3个步骤，介绍了这种语言模型的排序方法、反馈和与其它因素结合的方法，以及其在检索领域的应用效果，提出了语言模型在信息检索中的发展方向。

关键词: 语言模型, 信息检索, 平滑, 反馈

Abstract: This paper focuses on language model——a new kind of model applied in information retrieval. It begins with an introduction to the way of building up such a model through three stages. Some key aspects concerning this model like sort methods, feedback and combination with other factors are represented. And some facts on the application of language model in information retrieval are put forward to prove its efficiency. There is the prospect on its application in IR.

Key words: Language model, Information retrieval, Smoothness, Feedback