The research studied the development of a Lanna traditional music curriculum in the Nan cultural zone for Mattayomsuksa two utilizing an action research approach. The objectives of the study were: (1) to study the problems of the Lanna traditional music and the possibility of an inclusion of the music in the school local curriculum, (2) to develop a local curriculum of Lanna traditional music, (3) to determine the efficiency and effectiveness of  the curriculum and (4) to evaluate the suitability of the curriculum. The samplings for the curriculum implementation were two groups of students in Mattayomsuksa two, a group of 7 students and a group of 28 students.  Research tools were 1) a curriculum manual and learning plans, 2) interval informative tests and 3) students achievement tests.  The analysis of data was displayed in qualitative and  quantitative forms. 
                The findings from the study were: (1) the popularity of Nans traditional music was lessening to such a degree that it was becoming endangered, especially knowledge in traditional  singing, and tactics in playing Salo and Sueng. Songs that showed the uniqueness of the Nan Cutural Zone were Saw Long Nan.  Salor (string) Saw (singing) Sung (pin) Band was the only ensemble. (2) The curriculum aimed at developing basic knowledge of Lanna Traditional Music, skills in performing and having potential of further progression with an understanding  the importance of musical intellectual knowledge inherited, appreciation and  gratification of  the ancestors .  (3) The efficiency of curriculum revealed a statistic significance at 92.74/86.42 and the effectiveness was 0.74, (4) the feedbacks of experts on a suitability of the curriculum were at a high level. 
