[Purpose/significance] In the context of the national cultural digitization strategy, this article takes linear cultural heritage data as research subject and examines the semantic enhancement mechanism of linear cultural heri⁃tage data from a philosophical perspective. It provides a theoretical foundation for the intelligent construction of linear cultural heritage data. [Method/process] This paper primarily constructs a cognitive framework for the semantic en⁃hancement mechanism of linear cultural heritage data from three dimensions: "Dao" "Qi" and "Yong". Based on infor⁃mation processing theory and cognitive scheme theory, focusing on the progressive cognitive process of users towards linear cultural heritage, the article extracts three spiral upward cognitive processes: "user perception and data encod⁃ing" "content representation and knowledge linkage" and "semantic expansion and contextual interpretation". Based on this, a technical system for the semantic enhancement mechanism of linear cultural heritage data is constructed. [Re⁃sult/conclusion] The cognitive framework and technical system proposed in this paper provide theoretical guidance for the intelligent management and development of linear cultural heritage data from the top-level design perspective, lay⁃ing a solid theoretical foundation for the infrastructure of linear cultural heritage.