Khang ethnic communities residing mainly in the central area of Northwest (upper and middle part of the Da river). According to the results of the Population and Housing Census Vietnam in 2009, Khang ethnic has 13,840 people who reside mainly in 21 provinces of Lai Chau, Dien Bien and Son La provinces. The vast majority of Khang people live by milpa farming, water-rice farming only for support, where cultivation of milpa crops is the key activities. Almost all activities in the agricultural calendar system they all revolve around the cultivation of milpa crops on farms.