Cultural exchange and acculturation is a concept of transformation to adapt the different types of ethnic culture in the process of long-term exposure in many forms among cultures. The article contributes to recognizing the transformation through the exchange and acculturation process of overseas Vietnamese, and shows the development opportunities as well as the risk of a traditional Vietnamese culture. Considering the change of language, the religious and religious life, marriage and family, cuisine, analyzing the positive manifestations as well as the challenges in preserving the culture of the Vietnamese community in foreign. Preserving the traditional culture, but still having cultural exchange is a prominent color in the picture of Vietnamese culture abroad, but the preservation of Vietnamese and traditional culture in the generation Children have many limitations. Therefore, the state should have feasible and effective policies and measures to maintain and promote the good traditional cultural identity in the overseas Vietnamese community.