The present study aims at knowing the effect of applying quality criteria on developing the educational supervisor's performance at primary schools in Kuwait .The quasi- experimental method was used. The study sample included educational supervisors at primary schools in Kuwait. In addition, the research implements were represented by applying a pre and post questionnaire. Recommendations of the study were summarized in emphasizing the importance of making concepts, skills, values and principles of quality available besides enabling educational supervisors to get in touch with the successful patterns of applying quality criteria and know the best performance for each criterion. Moreover, the study recommends coordinating between educational supervisors while making supervision plans in a hand and coordinating between supervisors and school departments in another hand; the thing which helps make development plans to achieve integrity in the supervision plans.