The process of urbanization has developed rapidly since Doi moi, in the San Diu ethnic's villages of Hoa Thuong commune, Dong Hy district, Thai Nguyen province. San Diu people no longer live in rural areas, they now live in urban areas, along with the other ethnicities in the same commune. The process of urbanization has had significant impacts on the San Diu culture. Living in multi-ethnic commune, the culture of other ethnic groups has affected many factors of the San Diu traditional culture, including their language,d homes, clothing and lifestyles, which are diminishing in the process. To prevent the San Diu from loosing their traditional culture, in addition to the existing policies of cultural development, it is suggested the government build traditional homes in every hamlet in order to help the San Diu perform some of their cultural practices (language, ritual ceremonies, customs and habits, etc.) in their homes.