关键词标引在文献数据加工中具有重要的作用和意义。(1)关键词能表达文献主题,往往通过查看关键词就可以了解该篇文献的主题,进而判断是否需要阅读全文;(2)采用关键词标引可以较低的成本、较快的速度将海量文献构建成书目数据库,通过关键词串联相同主题的文献,为读者快速、准确地查阅和了解文献内容提供方便,避免全文检索中词汇相同而主题不同的文献干扰,确保用户检索到需要的文献。一般情况下,标引的关键词必须是表达某个主题概念的具有专业用语性质的词或词组。这个词或词组应该是名词或以名词为中 Keyword indexing plays an important role and significance in document data processing. (1) The key words can express the subject of the literature, often through reading the key words, we can understand the topic of this article, and then judge whether we need to read the whole article; (2) Keyword indexing can be cheaper, faster The massive literature is constructed into a bibliographic database. Key words concatenated with the same subject literature, to facilitate readers access and understand the contents of the literature quickly and accurately, to avoid the same text in the full-text search and the subject of different literature interference to ensure that users retrieve the required literature . In general, indexed keywords must be words or phrases of a professional linguistic nature that express a thematic concept. The word or phrase should be noun or noun