This research is the scenarios of educational administration of secondary schools in Thailand during the next decade (A.D. 2022-2031) by using EDFR research techniques, The research objectives were 1) To study the current conditions and problems of educational administration of secondary schools in Thailand 2) To study the scenarios of educational administration of secondary school in Thailand during the next decade (A.D. 2022-2031). The research results can be summarized as follows: I) The current state and problems of educational administration of the secondary school in Thailand overall practice is at a high level when considering each aspect, there are practices at a high level in all 8 aspects: 1) Planning and quality assurance 2) Academic affairs 3) Student affairs 4) Human resources 5) Administrative work 6) Finance and supplies 7) Building and environment services and 8) Community work and affiliate networks. As for the educational administration problems in Thai secondary schools, the overall practice is at a low level, when considering each aspect, there is a low level of practice in all 8 aspects: 1) Planning and quality assurance 2) Academic affairs 3) Student affairs, 4) Human resources, 5) Administrative work, 6) Finance and supplies, 7) Building and environment services, and 8) Community and affiliate networks. II) The scenarios of educational administration of the secondary school in Thailand during the next decade (A.D. 2022-2031) have 49 possible trends as follows: 1) Planning and Quality assurance 7 trends 2) Academic affairs 11 trends 3) Student affairs 8 trends 4) Human resources, 9 trends, 5) Administrative, 4 trends, 6) Finance and supplies, 5 trends, 7) Building and environment services, 3 trends, and 8) Community and affiliate network 2 trends.