简介： • Kammu is a cross-border ethnic group,located in Thailand,Lao PDR,Myanmar,China and other places.In China,there are over 3000 Kammu people,attributed to Blang.Kammu inhabited in other countries is a single ethnic group which is separated from other nationalities.What a nation Kammu is and how is its status quo of language use like?• As such a small ethnic group,surrounded by strong languages of many countries,what characteristics and principles does Kammu people's language use have? And has it come to decline?• In Laos,Kammu is moving toward opening up,and foreign exchange will continue to increase.In such a new socioeconomic environment,what changes has their language life had?• Kammu in Laos use bilingualism: on the one hand,use their mother tongue;and on the other hand,use the common language of the country,the Lao language.How is the relationship between these two languages? From what channels do Kammu people learn the Lao language? What are the principles of the acquisition? And what experience can other countries learn from?• Belonged to Kamuic branch,Mon-Khmer group,Austro-Asiatic Family,the Kammu language is complex,peculiar and worth significant linguistic values.What structural features does the Kammu language in Laos have? What relations does it have with the Kammu language in China?• This book tries answering the above questions on the basis of the first-hand materials achieved from the practical investigation,instructed by comprehensive research methods of linguistics,ethnology,and sociology.