Currently, there are about 100,000 people of Vietnamese origin living mainly in the northeastern provinces of Thailand, including Udon Thani province. Although having lived in Thailand for many years, the Vietnamese here still preserve and maintain many traditional cultural traits. This article focuses on clarifying the process of forming the Vietnamese community in Udon Thani province and their marriage rites, customs, and practices. The paper firstly clarifies the cultural characteristics as well as the process of cultural contacts and acculturation reflected in the marriage rites of the Vietnamese people in Udon Thani province. Finally, the article makes assessments and comments, and draws conclusions about the process and preservation, and cultural integration of this group of Vietnamese, thereby proposing solutions to preserve, promote and disseminate Vietnamese culture abroad.