The objectives of this research were: 1) to develop effective Hiragana and Katakana YouTube teaching materials and flipped classroom for Thai students. 2) to compare the reading skills of Hiragana and Katakana by using YouTube teaching materials for Thai students before and after study. 3) to study the writing skills of Hiragana and Katakana by using YouTube teaching materials and flipped classroom for Thai students. and 4) to study the students’ opinions after using YouTube teaching materials and flipped classroom for Thai students. The target group was new first-year high school 38 students at Satrinonthaburi School. The research instruments were used a pre-test and post-test of Hiragana and Katakana, a writing test, and a questionnaire survey. The data analysis used frequency, percentage, mean, standard deviation, and t-test dependent