Tourism is an important measure to realize the rural rejuvenation in the arctic-alpine areas at present. Identifying the current support of tourism from residents, as well as its influencing factors, is conducive to the precise formulation of tourism-development policies. This study utilized the Gannan Tibetan Autonomous Prefecture as the study area, which highlighted the ethnic cultural characteristics of this particular area. With this exemplar, we established a tourism-support-degree model based on cultural integrity, sense of locality, trust of tourism institutions, and tourism-event attachment as independent variables. The key factors that affected the residents' support of tourism were also analyzed. The results indicated the following. The first major finding was that the highest degree of support for tourism was found in Tibetan inhabitants, followed by that of Hui nationality inhabitants, whereas Han ethnic inhabitants had the lowest degree of such support. Additionally, there was a trend for a decreased degree of support for tourism among herdsmen, monks, priests, housewives, students, private business owners, and civil servants. In terms of analysis of the categorical preferences of inhabitants, the ranking of degrees of support of tourism from highest (1) to lowest (5) were as follows:(1) the ‘relocation type’ rural-community inhabitant; (2) the ‘homestay developing type;’ (3) the ‘temple and scenic spots household type’; (4) the ‘temple and monks domiciles’ type; and (5) the ‘adjacent to scenic spots type.’ The second major finding of the present study was that one's perceptions of tourism-related factors tended to influence one's degree of support for tourism. Specifically, a perception of tourism as a benefit tended to increase one's support of tourism, whereas a perception of tourism as an expense tended to reduce one's support of tourism. Additionally, an inhabitant's trust of travel organizations and inclinations toward traveling activities had positive influences on the perception of tourism as a benefit, whereas such perceptions had a negative impact on the perception of tourism as an expense; hence, these perceptions ultimately affected an inhabitant's degree of support for tourism. Similarly, an inhabitant's cultural adaptation and inclinations toward traveling activities exerted direct positive influences on support for traveling as well as tourism, while simultaneously weakening one's perception of tourism as an expense. Taken together, this article puts forward countermeasures and suggestions for improving the degree of support of tourism from local inhabitants currently living in the artic-alpine ethnic areas.