Researchers studied wild Castanea mollissima communities in Taikuan River Nature Reserve, Shanxi. They used TWINSPAN and DCA to analyze the structure, species composition, and distribution of these communities. TWINSPAN divided the communities into 11 associations, showing influences of disturbance, slope direction, and soil organic matter. DCA revealed that slope direction, terrain, and soil type were important factors affecting community distribution. The first axis of DCA showed the impact of slope and slope direction, while the second axis indicated the relationship between community and environment. The diagonal of DCA reflected variations in communities and forest floor thickness. Dominant species had similar distribution patterns, influencing community types.