关键词: 隐马尔可夫模型, 环境保护档案, 环境影响报告书, 信息抽取, 决策支持

Abstract: Facing more and more serious environmental problems, effective information extraction methods urgently need to extract useful information from environmental protection files for supporting macro decision-making. This paper takes environmental impact reports for example to research how to use the Hidden Markov Model（HMM） to extract environmental impact assessment information of construction projects. Elements and applications of HMM are clarified. The foundational thinking that how to use the HMM to extract information from the text of environmental assessment reports is given after analyzing the characteristics of environmental assessment reports. The methods and specific steps that how to build and apply the HMM are given. The method is verified by example. It comes to the conclusion that using the HMM to extract environmental protection information can get high recall and precision.

Key words: Hidden Markov Model（HMM）, environmental protection file, environmental impact report, Information Extraction（IE）, decision support