This paper was aimed to design master teacher's job modeling, and to explore how to introduce master teacher in the school. For this purpose, a preliminary examination and focus group conference were conducted, and questionnaires, for the survey, were distributed to 280 respondents. The professional research group was organized and modified job fields, job description, job specification, and job performance standards. Job analysis of this study was based on the job classification of master teacher in the school. Jobs of master teacher were classified to 14 core-jobs and 21 sub-jobs. In addition, in regard to the evaluation of relative importance of jobs, the importance of job for teacher and staffs development field is higher than that of the other fields. The importance of core-jobs is from M=3,53 to M=4.51 and expectation frequency is from M=3.02 to M=4.00. The results of this study are based on the understanding of master teacher's role for facilitating school improvement. and this study will provide a guideline for institutionalization of the scheme of master teacher in school.