As per the history, the Dimasa tribes are said to be the earliest inhabitants of the Brahmaputra Valley and the meaning of the word `Dimasa` is the children of the big river that connotes Brahmaputra River. Dimasa tribes belong to the Indo-Mongoloid group which includes the Bodo Tribe and their allied tribes. They have prominent Mongoloid features with high cheek bones, slit eyes and scant beard. They call themselves Bodo or Bodo-fisa in the Brahmaputra valley and Dimasa or Dima-fisa or `sons of the great river` in North Cachar Hills and Karbi Anglong District.

Most of the people of Dimasa tribes reside in the Jatinga Valley, North Cachar Hills of Assam. The total population of the Dimasa tribal community constitutes of ten percent, each and every member of this Dimasa tribal society are financially well off. Dimasa tribal community is very much pious and religious minded. Festivals, musical melodies, religious rites and customs too have enriched the culture of the Dimasa tribal community. The supreme deity in the world is the Banglaraja as per the Dimasa tribal community. These tribal people worship several deities like Lord Banglaraja, Sibrai, spirits of ill- will and good wills, Sakainjeek, Madai.

People belonging to Dimasa tribal group believe in the existence of a supreme being Madai - under whom there are several Madais including family deities and evil spirits. The religious practices of the Dimasas are reflected in their Daikho system. A Daikho has a presiding deity with a definite territorial jurisdiction and a distinct group of followers known as Khel. Every Dimasa Kachari family worships its ancestral deity once a year before sowing the next paddy. It is known as Madai Khelimba. This is done for the general welfare of the family. They cremate their dead. The widow does not tie their hair till cremation. The dead body is cremated by the side of a river or stream.

Dimasa tribal people build their houses on hill slopes with a river or streamlet flowing nearby. The houses are generally built on plinth of earth - in two rows facing each other with a sufficiently wide gap in between. An important institution of the village is `Hangsao`. It is an association of unmarried boys and girls of the village. It is organized for the purpose of working together in cultivation and lasts only for one year. Throughout the year, the members of the Hangsao work together in the Jhum cultivation by rotation an area of land at every member`s field.

Music and dance play an important role in the day-to-day life of the Dimasa Kachari people. The Dimasa tribal people celebrate several occasions and festivals namely Bushu and Hangsao with playing instruments, traditional dance. The males and females of this community are dressed in their traditional dresses during these festivals and some of them take part in folk dances. The dance forms of the Dimasa tribe are complex in character. They are strictly dependent on instrumental music. No songs are used. Khram follows the rhythm of the Muri and so also the dancers. Interestingly, there are variations with noticeable microtones for different dance forms. That is why young men practice dancing at Nadrang during leisure hours whereas the village kids follow the rhythm from an early age. By using their traditional musical instruments like Muri, Muri-wathisa, Supin Khram, Khramdubung, they present their traditional dances named - Baidima, Jaubani, Jaupinbani, Rennginbani, Baichargi, Kunlubani, Daislelaibani, Kamauthaikim Kaubani, Nanabairibani and many more.

Among the traditional wears, rikaosa, richa, paguri rimchau and rimchaoramai are worn by men and rikhra, jingsudu, rijamfini, rikaucha, rijamfinaberen, rigu etc. by women. The women of this community wear different ornaments like Chandraral, Jingbri, Jongsama, Kamautai, Kaudima, Longbar, Rongbarcha, Panlaubar, Khadu, Enggrasa, Ligjao. Thus, it is clear that the traditional dresses, costumes and festivals appositely depict the rich culture of Dimasa tribes.