This research article aimed to: 1) examine the levels of operation and the practices of Sufficiency Economy Philosophy, 2) compare the practices of Sufficiency Economy Philosophy, 3) examine the relationship between the level of operation and practices of Sufficiency Economy Philosophy, and 4) confirm the results of the outcomes in the development of learners. The sample consisted of 359 people: 316 teachers and 43 administrators, during the academic year 2021. The research instrument was a 5-point rating scale questionnaire with a reliability of .92. Data were analyzed in terms of Mean, Standard Deviation, t-test, F-test, and Pearson Correlation Coefficient. The results of the study revealed that: 1) overall, the levels of operation and practices of Sufficiency Economy Philosophy were at a moderate and high level, respectively, 2) the comparison of the level of operation and the practices of Sufficiency Economy Philosophy when classified by the aspect of training time revealed significant differences (p<.05), 3) there was a significant correlation at a moderate level between the level of operation and practices of Sufficiency Economy Philosophy (p<.05), and 4) in-depth interviews confirmed the consistency between quantitative and qualitative findings.