Abstract: This article is based on a field investigation of first-hand materials,The language life of Jingsan Village, Jinghong City, Xishuangbanna was described and analyzed. Come to three points of understanding:Jingsan Bulang is a language transfer type; The bilingual life of the Dai language and the national lingua franca is the mainstream; The Jingsan Bulang gived up the mother tongue, the main reason for switching to Dai language is that they have established close economic and cultural ties with the Dai people around them, and high recognition of Dai people and Dai language.

Key words: national language transfer, The Jingsan Bulang People, Case investigation