Abstract: 【Objective】Natural forests could be more scientifically managed by understanding the nutrition utilization status and spatial occupation capacity of the main tree species in natural Pinus taiwanensis communities in different soil nutrient resource spaces in the Daiyun Mountain Nature Reserve.【Method】 Based on the compartmentalization of the ecological niche space, the niche breadth, overlap, and similarity of the main tree species in the area were studied.【Result】① Resource availability influenced niche matrices greatly. Pinus taiwanensis, Castanopsis faberi, Schima superba, Pinus massoniana, Rhododendron latoucheae and Toxicodendron succedaneum, whose niche breadths were all above 0.700, were the species with larger niche widths under different measures. There was no significant correlation between niche breadth values and important values. ② The niche breadths of Pinus taiwanensis, Castanopsis faberi, Schima superba, Pinus massoniana, Rhododendron latoucheae and Toxicodendron succedanum were larger, with niche overlaps of 0.424, 0.321, 0.328, 0.290, 0.303 and 0.294, respectively. ③ The expression of the relationship between niche breadth, overlap and similarity was as follows: the consistency of variation trends between niche similarity and overlapping degrees of all major species were basically confirmed; the species with larger niche widths were more likely to overlap with other species; however, their degrees of overlapwere not necessarily larger.【Conclusion】Pinus taiwanensis had a larger niche overlap with other species. Additionally, in the wake of species numbers in the same resource niche and with diminishing resources, the species would face intense competition. Pinus taiwanensis dominance might be replaced by Schima superba and Rhododendron latoucheae, which have the ability to adapt to many environments. Thus, it is suggested to adopt artificial interference measures, and to strengthen the management and protection of P. taiwanensis.