Abstract: In this paper,the age and performance structures of Acanthopanax senticosus population under three natural secondary forests and on cleared area are analyzed. It's shown that under fiatural secondary forests, the development of A. senticosus population is consisted with community succession, being a progressive population. The mean age of this population is positively correlated with community stability, and its maximum age and mean density are related to physical environment and disturbed level. The number of its individual plants varies with age, and its performance structure (height, weight and diameter class) has significant difference under forests and on cleared area, owing to the difference of habitats, disturbed levels and age stages.

Key words: Acanthopanax senticosus, Clonal plant, Population structure