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主题标引是建立“节水农业文献数据库”主题检索系统的关键工作。它以《汉语主题词表》及相关专业词表为基础，依据节水农业文献的专题综合性、地域性和服务性的特点，优选词表内的主题词，并增补专指性较高的主题词，共计 ３１０６个主题词。又按既定的一套主题标引规范，实施科学标引，以便提高本文献数据库的检全率和检准率，满足用户主题检索的需要，利于节水农业文献资源的开发利用。
Thematic indexing is the key task of establishing a thematic retrieval system of “water-saving agricultural literature database”. Based on the “Thesaurus of Chinese” and related professional vocabularies, according to the characteristics of comprehensive, regional and service features of water-saving agricultural literature, it prefers thesauri in thesaurus and supplements the high-specific Keywords, a total of 3106 keywords. According to the established set of indexing norms, the implementation of scientific indexing in order to improve the accuracy and accuracy of the database in this paper to meet the needs of the user search, which will benefit the development and utilization of water-saving agricultural literature.