Research on the culture of ethnic groups in the Central Highlands has been receiving much attention from scientists. The Mnong people are also the object of researchers' interest. However, studies on Mnong ethnic minorities and the content is not in-depth. Recognizing the importance of the Mnong in Dak Nong as well as in the Central Highlands, the authors chose "Beliefs and festivals of the Mnong ethnic group in Dak Nong province" as the topic for the doctoral thesis. Up to now, after the time of supplementing and perfecting, the authors have introduced monographs "Beliefs and festivals of Mnong people" to those who are interested, contributed a useful document for studying and understanding beliefs, festivals of the Mnong people in particular and the Mnong ethnic culture in general.