This book shows the hill tribe in northern of Thailand that is Karen, Hmong, Lahu, Yao, Lau, Akha, Lawa and Khamu. They migrated from other places into Lanna kingdom such as Karen was originally in China before they had moved to Burma in 6^th or 7^th century (B.C. 11 or 12) and then to Lanna Kingdom and Lau who moved from Lao. The hill tribe follow their beliefs and prohibition about settlement. Most of them settled down scattered. Their village size begins from 2-3 households up to 120 households. Referred to the survey from Hill tribe Research Institute in 1984, it was found that the hill tribe population in Thailand was 429,001 people and 83-percent of them lived in northern of Thailand. They mostly earn for a living by planting rice, farming and transplanting. They do slash and burn agriculture with the rains. Some hill tribe do the rotation farming such as Hmong, Yao, Lau, Lawa and Ahka. Village is the most important social institution and centralization for social relation, economic and ritual. Their family structure consists of 2 aspects: extended family is mostly found in Hmong and Yao and single family is mostly found in Karen and lawa. Every village, except in Lisu, has the leader and the deputy as a guardian and a representative to authority. Some villages have elder group for consultant. All of them believe in spiritual in which the spirit stays in nature. Moreover, they have offerings for the spirit and also a sorcerer. Their belief sometimes is mixed with other religions such as Buddhism in Dhamma Jarika project and Christ from missionary. The relationship between the hill tribe and Thai people since Lanna kingdom era untill now has 3 aspects: (1) Relationship between Ruler and the follower from Lanna era throughout absolute monarchy era (2) the relationship on their connecting between hill tribe and the northern people (3) the relationship between hill tribe and the authority which tries to enhance the developing plan for them and implements to mixed culture with Thai people such as changing their belief to Buddhism, having formal education as same as Thai people and Getting married with Thai people as well.