The objectives of this research were 1) to study basic information for develop internal quality assurance in basic education school 2) to construct and develop a curriculum for blended training to develop internal quality assurance and 3) to study the results of using a curriculum for blended training to develop internal quality assurance. The research methodology consisted of 3 phases: Phase 1, study basic information, Phase 2, curriculum construction and development, and Phase 3, Try out and improvement of the training curriculum. The target group of the research was 40 teachers responsible for Internal quality assurance who voluntarily attended the training. Data were analyzed using descriptive statistics: percentage, mean, standard deviation. The results showed that 1. The results of the study of the basic data of the training curriculum should be a curriculum with a development process that encourages teachers to have knowledge, skills, and attitudes toward internal quality assurance 2. Blended training curriculum for Internal quality assurance of teachers in basic educational Schools consists of 1) Principles of the curriculum 2) Objectives of the curriculum 3) Contents of the curriculum 4) Curriculum structure 5) Training guidelines 6) Training materials and learning resources and 7) Measurement and evaluation training. 3. The results of using the blended training curriculum to develop Internal quality assurance found that 1) knowledge and understanding about internal quality assurance after training passed the set criteria, namely 80 percent with an average score of 89.93 percent 2) The operational skills for internal quality assurance of teachers after training pass the set criteria, which is 85 percent with an average score of 88.50 percent 3) The attitude towards internal quality assurance of teachers after the training passed the set criteria with a very good average score of 92.60