Currently, the application of the big idea in sport disciplines faces several challenges, including vague conceptual definitions, contradictory conceptual expressions, inaccurate concept validation, and insufficient practical implementation. To strengthen cognitive understanding, the following aspects should be addressed:First, the big idea of sport disciplines refers to an integrated and interconnected systematic framework or explanatory model abstracted from the teaching context of physical education and health courses, whose expression should take the form of declarative statements describing the relationship between two or more concepts.Second, while related to core literacy, the big idea of sport disciplines is distinct from it; it is constructed through the processes of experientializing phenomena, conceptualizing experience, and structuring concepts.Third, the criteria for identifying a big idea include presenting a networked structure, embodying the metacognitive characteristics of the discipline's ontology, and demonstrating strong relational validity. Its formation depends on a complete and systematic set of unit entities, self-constructed learning approaches, authentic teaching contexts, and teachers'interpretive literacy.The proposed development path involves: taking curriculum experts as the main actors to systematically construct the conceptual system of the discipline; using curriculum organization as the leverage to give full play to the structuring function of big ideas; and referencing mature international models while critically adapting foreign experiences of big idea development.