The objectives of this research were to examine the relationship between exposure to information, knowledge, attitude, and participation in forest and watershed rehabilitation, and to compare these factors between the Lisu ethnic group and the Thai residents in the study areas. The population consisted of 150 families of the Lisu at Huay Nam Dang Village, 85 families of the Lisu at Huay Nam Ru Doi Sam Muen Village, and 150 families of the Thai residents at Mae Lao Village. The sample group comprised 335 subjects selected from the population. The research findings revealed that exposure to information was related to knowledge about, attitude toward, and participation in the rehabilitation. Knowledge was related to attitude toward and participation in the rehabilitation, whereas, attitude was not related to the participation. Exposure to information, knowledge, attitude, and participation were related to population characteristics and were different between the Lisu ethnic group and Thai residents. The ethnic group was exposed to mass media at a low level due to poverty. Their relationship with their leaders and officials was not good, leading to difficulties in disseminating new knowledge and information. Moreover, transportation was not convenient, leading to a low level of participation with state officials. Exposure to information of the Thai residents was also at a low level because subscription to printed media was low. Although the village issued printed materials about forest and environment, the villagers were not interested because they had to earn a living. However, the villagers had a good attitude toward and relationship with forestry officers, so their participation in activities was good.