The study found that there were twenty-three competencies that superior job performers used in carrying out this job well. Consequently, the researcher uses current level of importance of competency as primary information to recommend nine competencies in a competency model. This competency model will help the Thai Department of Agriculture to respond to government policy regarding human resource management, provide useful information about the specific characteristics required at the Chief of the General Administrative Sub-Division level and on how to implement further enhancement of employee performance at this level. These competencies will also enable the Department to determine the critical competencies necessary for current success at this job level and the strategic competencies necessary for future success.