Abstract: This article is based on a field investigation of first-hand materials,The article describes the harmonious multilingual life of Manshan Xiazhai in Dalo Town, Menghai County, Xishuangbanna Prefecture,Come to three points of understanding:The mother tongue of Manshan bulang people is well preserved and will continue to be passed on;Harmonious ethnic relations are the guarantee of language harmony;The language harmony of frontier ethnic groups is conducive to the frontier solidarity and national security.

Key words: Language Harmony and Frontier Solidarity, Bulang people, ManShan village