The objectives of this research were: 1) to study the current situation and problem of Knowledge Management of the office of the primary education service area, 2) to develop a Knowledge Management model, 3) to study the success of the implementation of the Knowledge Management system. There were 25 persons in the target group. There were 2 kinds of instrument: the instrument for work development was the Handbook for wok implementation, and the instruments for data collection were: questionnaire, semi -structured interview form, action record form, knowledge Test. The statistic used for data collection included the percentage, mean and standard deviation. There were 3 phases of research implementation including: Phase 1: to study the current situation and problem, Phase 2: to design the Knowledge Management Model for developing Quality, and Phase 3: to use the Model, and study. The research findings found that: 1. The findings of current situation and problem the implementation was in "Moderate" level. Problems in using knowledge for organization, in every aspect are in "High" level. 2. The findings of model usage, and success in Knowledge Management for developing the Quality in Public Sector Management, in overall are in "High" level. 3. The findings from evaluating the success of the Knowledge Management model, based on indicators of success from the model, were that propriety was at an overall "High" level.