关键词: 信息抽取, 主题区域, 文本结构权重, 去噪

Abstract: Along with the development of the Internet, the Web Data Mining（DM） is becoming more and more significant with regard to the acquisition of thematic information. This paper parses the webpage into tag trees based on the tree structure, puts forward the data range mining and semantic chained block recognition algorithm based on the tree matching algorithm, carries out the preprocessing for unlinking, raises the concept of text structure weight, discovers the subject area with the calculation result of text structure weight and acquires the thematic information after denoising. The experiment shows that the research result displayed in this paper is of great importance to the identification of news and blog webpage.

Key words: information extraction, subject area, text structure weight, denoising