An authority in the school of cognitive psychology, Jean Piaget (1896-1980), constructed the Cognitive Development Theory, which had far-reaching effects in the field of education. The theory is not only widely applied, but also become an inspiration to many psychologists and educators of the contemporary and later periods. This paper conducted by literature review and research on cognitive development to analyze its implications on the physical education teaching in schools. This paper first presented a brief introduction to the core elements of the Cognitive Development Theory to provide readers a background understanding. Next, an overview of the implications of the theory was presented with four concepts: 1. analysis of the correlation between physical education teaching and cognitive development theory; 2. emphasis on the connection between physiological and psychological development; 3. adjustment of the teacher's teaching strategy to fit the thinking models of children; 4. focus on the establishment and connection of the "schema." The theory proposed by Piaget are widely studied, discussed, and criticized in many fields. The conclusion of this paper covered merely the tip of the iceberg, as this paper was aimed to provide physical education teachers a reference for future thought development.