Effectively designed ecological corridors can eliminate the impact of habitat fragmentation on biodiversity, promote gene flow and the genetic diversity of endangered species, and maintain the structural integrity and functional stability of natural ecosystems. In this study, we used the MaxEnt model to analyze habitat suitability for red deer (Cervus elaphus) in the southern Greater Khingan Mountains, Inner Mongolia. We created a minimum cumulative resistance model to identify potentially ecological corridors for red deer. Results showed that red deer habitats in the study area were fragmented. The red deer population had an obvious trend of isolation distribution; the existing suitable habitats were characterized by low elevation (800-1200 m) and a gentle slope (<15°) close to a water source, and the suitable habitats mostly consisted of forest shrub or grassland vegetation close to woodland edges. The creation of 12 ecological corridors would encourage red deer dispersal and support habitat connectivity. Three main characteristics of the corridors that were conducive to habitat restoration management measures include-passing through shallow rivers, irregular topography, and being located far away from human residences. The comprehensive analysis of habitat suitability and ecological corridors from a large-scale perspective may help optimize red deer habitat distribution. The analysis can provide practical guidance and basic information for the conservation of the species in the southern Greater Khingan Mountains.