Narrative, as a research approach, can present the behavior and events in instructional practice through "storytelling," reflecting the educational significance of "stories." Although narrative study is a developing subject in the education field, it is not common in the field of Chinese as a second language/ Chinese as a foreign language (CSL/ CFL) research. This paper, through several narrations, explains the importance of performing a narrative inquiry to understand the formation of the knowledge structure of CSL/ CFL teachers, elaborating on their cognitive system construction and promoting their professional development. The narrative is not only a research tool but also an approach or medium for the cognitive construction and professional development of teachers.