In recent years, the rapid expansion of Protestantism in Hmong community and some other ethnic minorities in the North-West Vietnam has caused many changes. The Hmong and the other ethnic minorities have lived in many Asian countries such as China, Vietnam, Laos, Thailand, Myanmar, so the religious conversion has not been an issue of Vietnam but it has also been a common matter in many countries. In Vietnam, the speedy development of Protestantism in Hmong community and some other ethnic minorities has led to positive and negative impacts on many aspects of politics, culture, and society. Despite in the context of summary 10 years of implementation of Directive of the Vietnam Prime Minister on some tasks toward Protestantism, many local authorities have confused. This article explained the causes that led to the conversion of a part of Hmong people to Protestantism. It is an initial outline, so we need to have a deep research in order to have comprehensive evaluations. | A further discussion on the causes led a part of Hmong people converted to protestantism