Freemasonry is a mysterious society that is almost unfamiliar to the masses, but most of its outstanding members hold key positions in government in many countries, especially in USA, UK and France. Freemasonry has always been closely associated with the cultural, economic and political development of the US and European countries. The process of invasion and colonial occupation entailed the presence of Freemasonry members in the world. Vietnam was dominated by the French for over a century and more than twenty years later with the participation of the US in the South, the presence of Freemasonry in Vietnam was understandable at this stage. The Freemasonry study will help to better understand the Indochina colonial issue and the US presence in South Vietnam. Thereby, we will see a part of the truth obscured in the heroic history of the nation's anti-aggression and the brave and intelligent victories of the Vietnamese against the powerful forces in the world.