Confucianism was born twenty-five centuries and has lasted for so long over a wide area including China, Korea, Japan, and Vietnam. It is one thing to explain why Confucianism has such an immense influence on many East Asian countries. Explaining this would certainly be difficult to convince if the mere theory of its richness and depth. It must have the conditions to be born and exist in the socio-economic base of East Asia, first of all in China, where it was born. The conditions for its birth only exist in China, but the conditions for its long-term survival are in all three countries of Korea, Japan, and Vietnam and must be similar to those in China, at least about culture generally. The feudal dynasties of Vietnam have begun to use Confucianism was an effective way to govern and manage society. Based on the study of ancient bibliographies, in consultation with researchers and colleagues, this study provides insights and assessments of the Confucianism imprints in cultural andthe ancient laws issued under feudal dynasties of Vietnam; It also raises some controversial issues about the position and role of Confucianism in the history of Vietnam.