This book is a study on rituals of mature ceremonies and funerals of the Dao Tuyen people in Bao Thang district, Lao Cai province. Dao Tuyen is a small member in the group of Dao Lan Tien ethnic people in Vietnam, they are living mostly in Lao Cai, Ha Giang and scattered in other provinces. The main content of the project consists of 3 chapters. Chapter 1: Overview of the Dao Tuyen people in Bao Thang, Lao Cai. Chapter 2: Mature rituals and funerals of the Dao Tuyen people. Chapter 3: The values of mature and funeral rituals of the Dao Tuyen people (historical values, humanities values, artistic values, community cohesion values). The author also proposed solutions to preserve and promote values in the life of ethnic group.