This research aims to design integrated lesson plans of social, religion and culture; Or-Pu story for Prathom Suksa 5, Weang Pa Wittaya School, Chiang Rai Province. The population is used by snowball sampling consisting of five people; three teachers who have experiences in teaching social and two teachers or experts who have experiences in teaching Lao Hu ethnics. The instruments used in this study are five integrated lesson plans and each plan covers three hours, lesson plan evaluation form and focus group discussion record sheet. The data is analyzed by mean score and standard deviation and presented by table together with descriptive analysis. The results are as follow; The researcher has designed five integrated lesson plans including; lesson plan no. 1 “The origin of Ao Phu”, lesson plan no. 2 “Becoming Ao Phu”, lesson plan no. 3 “Ao Phu and his way of life”, lesson no. 4 “The conservation of Ao Phu together with Lao Hu” and lesson no.5 “The development of Ao Phu.”. The evaluation of lesson plans found that designing integrated lesson plans of social, religion and culture; Ao Phu story for secondary students at Wiang Pha Wittaya School, Chiangrai are all at appropriate standard and the total standard result of lesson plans are at high appropriate.