Abstract: Based on the investigation in 8 age-class stands (from age 0.3 to 37 years old)in Huitong，Hunan，the changing process of species diversity of the Chinese fir plantation community was studied，the relationship between species diversity and community stabil-ity was also discussed．The results showed that the species diversity index of each age-class stand is 2.2—3.5 and the evenness is 0.64—O.85，the ecological dominant values is 0.04—O.18．The study would provide scientific basis for biodiversity conservation and sustainable utilization of the artificial forest．

Key words: Chinese fir, Age class, Species diversity, Stability