The Phuan language is one of 7 linguistic affiliations passed down from Yunnan-Chaing Saen. This language in scattered areas of around Thai Laos, Mynmar, Vietnam, Malaysia, India and the southwest of the People’s Republic of China. The significant changes in the characteristics and meanings of words in Phuan are: there are more phonemes of the initial letters; clusters; changes of consonants which were originally short vowel sounds and there is a sound /?/ as a syllable combined with long vowel sounds and /k/ in some words. This sound is changed to be /kh/. The difference in age of the language uses is a significant factor that differentiates the language used. The number of other words used with the original ones is more than the original words. Some words are no longer used because of these changes. This shows that all languages are living and it always changes naturally. The reasons for this may be element or social contexts – the location of the community, occupation and their values which they do not want to be different from the mainstream of the society.