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This invention discloses an industry dictionary for the data analysis field, its construction method, and a semantic element recognition system. The industry dictionary for data analysis includes: an entity lexicon for storing entity words related to the data analysis field; a semantic element lexicon for storing the semantic elements corresponding to each entity word; and a mapping relationship lexicon for storing the mapping relationships between entity words and their corresponding semantic elements. By constructing a structured, dynamically updatable industry dictionary, this invention persistently encapsulates and reuses the powerful semantic understanding capabilities of large language models, successfully transforming the semantic element recognition task from "requiring complex model calculations each time" to "requiring only simple dictionary lookups in most cases," thus achieving breakthrough technical effects in terms of efficiency, cost, and intelligent evolution.