Li Yupei’s mathematical fairy tales combine literary and artistic qualities with unique educational value. This study analyzes his representative work，The Detective Takes the Case，from the perspective of mathematical core competencies. By further examining a broader range of his fairy tales，the paper explores his creative methods and discusses their potential for transmedia development. The goal is to provide insights and references for contemporary mathematical science popularization.

mathematical fairy tale  /  core competencies  /  popular science writing