Content: Chapters: 1 - Some theoretical concepts. 2 - The Mang people in Vietnam and the research process. Overview on the Mang people in Vietnam. 3 - Human being circle's ceremonies of the Mang people. Giving birth. Bearing up children. Marriage & wedding. Medicine treatment's rites & rituals. The funeral procession. 4 - Professional rituals & ceremonies. Ancestral worship. Festivals & holidays. 5 - The changes in family's ceremonies. The trends. The causes & results. Some recommendations. References.