Through the survey of Southeast Asian students of Chinese origin in universities of Fujian province，we hope to find out the current situation of language use and cultural identity of Southeast Asian students of Chinese origin. The survey finds that most of the students in Southeast Asia are multi-language users，the language of the host country occupies the main position in language life of southeast Asian students’. Mandarin is playing an increasingly important role at the same time，Shrinkage of dialect has become increasingly prominent. Southeast Asian students still have a strong sense of Chinese culture，which also makes them different from students of non-Chinese origin in the study of mandarin. In the great trend of globalization and cultural diversity，we should further cultivate and consolidate the multilingual ability of students of Chinese origin.