The objective of this research was to develop online Instruction Thai Dramatic Arts to practicing behave skill using Flip Classroom form in grade 7 at Princess Sirindhorn’s College school to evaluate quality about content and technique. Find efficiency online Instruction. To compare the learning achievement before and after studied. To study the satisfaction of student with their Princess Sirindhorn’s College school. The sample group used in this research are grade 7 year of education 2019 was 30 people from a simple random selection method. The research used online Instruction Thai Dramatic Arts to practicing behave skill using Flip Classroom. Used achievement test and evaluate quality test. Then, obtained data were analyzed by using mean, standard deviation, and t-test Dependent. The result of the research showed that online teaching materials Thai Dramatic Arts to practicing behave skill using Flip Classroom have good measure (  =4.92 S.D.=0.23). The efficiency of material has valuable 81.55/85.33 which was higher than the specified 80/80. The achievement of post – test ( = 25.60, S.D.= 1.94) higher than pre – test ( =24.10, S.D.= 1.68) that significance at .05 and evaluate quality of student with website that help teaching Thai Dramatic Arts to practicing behave skill by using Flip Classroom teach were in great level.