Abstract:Age and height structures of Cryptocarya concinna seedlings in Heishidingsubtropical forest, Guangdong Province, were analyzed. The seedlings in permanent transects were tagged, measured and censused at bimonthly intervals during one year period from April 1993. Due to the seedlings having no obvious morphological characters for age identification, a method for conjecturing seedling age by dualityy linear regression with the seedling height and basal diameter of the seedlings was suggested. This method provides a tool for studying age structure of C. concinna seedlings. Seedlings of 2 and 3 years old constituted overwhelming majorty. Seedling abundance showed annual tluctuation as the number of seedlings with 3 to 4 years old decreased markedly. If the seedlings were grouped into height class based on an interval of 10 cm, it appeared that there was a seedling pool at 10- 30 cm height, which composed of 2-4 years old seedlings.