The main purpose of this study was to describe a process of occupational socialization in a dance sport educator to provide basic information for teacher education. For this, life history approach with in-depth interview in qualitative research was employed to describe and analyze data. The collected data was analyzed by using Spradley's(1979) etnhographic interview analysis method, including reducing data to conceptual themes and categories that identified as factors affecting expertise development of a dance sport educator. The major results of the study can summarized according to the research problem. It was found that factors affecting expertise development included numerous teaching experience before getting pre-teacher education, social relations, and teaching instruction. These factors played interacting roles coming outside and specified expertise as a dance sport educator. Thus, the process of occupational socialization of dance sport educator consisted of the period entrance circle, surviving, conflict, and growing up