The purposes of this research were to study the factors of effectiveness management model for sub-district secondary school, to investigate current situations and desirable situations of effectiveness management model for sub-district secondary school, to develop the effectiveness management model for sub-district secondary school and to study the effects of effectiveness management model for sub-district secondary school. This study was conducted in 4 phases which include first, studying the factors of effectiveness management model for sub-district secondary school, secondly investigating current situations and desirable situations of effectiveness management model for sub-district secondary school, thirdly developing effectiveness management model for sub-district secondary school and the last examining the results of usage of the effectiveness management model for sub-district secondary school. The target group consists of 33 teachers at Dongmafaiwittaya School, Secondary Educational Service Area Office 23, which was the research field. The instruments used in this study were two types: Firstly manual of development effectiveness management model, Secondly instruments used for data collection: questionnaire, non-structure interview and evaluation form. The statistics used for data analysis were percentage, mean and standard deviation. The findings of the research were as follows: The factors of effectiveness management model for sub-district secondary school comprised of input, process and output; the current situations and desirable situations of effectiveness management model for sub-district secondary school were in the ‘highest’ level in every aspect; the development effectiveness management model for sub-district secondary school found that the factors of effectiveness management model for sub-district secondary school comprised of 3 aspects, 18 main factors and 102 sub-factors; the results of using the effectiveness management model for sub-district secondary revealed that it was suitability and feasibility in overall. Key words: Effectiveness management, sub-district secondary school, development effectiveness.