[Purpose/significance] Deconstructionof the core concept of"data security"and construction of its concept system based on international standards can provide reference for the standardization of terms in China's data security theory and practice,promote the construction of China's data security system,and further promote the modernization of the national security system and capabilities.[Method/process] Using the content analysis method, we select the defi? nition of terms related to "data security" in the international standards as the sample, trace the evolution of the concept of data security, deconstruct the meta concept of data security, extract the concept cognitive dimension.On the basis of clarifying the relationship between concepts, we construct the concept system of data security,and then interpret its con? tent and logic. [Result/conclusion] The concept of data security has five cognitive dimensions: purpose, attribute, be? havior, scene and facility, so as to deduce five data security related concepts: data security purpose, data security attri? bute, data security infringement behavior, data security scene and data security facility. There is a partitive relations, generic relations and associative relations between data security and its related concepts, related concepts and other concepts, and other concepts. The "entity relationship entity" structure of three groups of concepts forms a data security concept system.