Abstract: Fractal dimensions of crown surface area is developed by regression using data based on crown volume and foliage mass from 31 analysis trees of 7 permanent sample plots.Meanwhile biology model Lw=0.180397D^3045903H^-1.67348 is established to estimate foliage mass according to actual measurement.Combining data from branch analysis and stem analysis, we can dynamicly estimate crown volume one year, two year, three year ago.And furthermore the relations with power functions between crown volume and foliage mass may dynamicly estimate fractal dimensions of crown surface area one year, two year, three year ago.Therefore reflect tree crown construction variable dynamic regulation.For grasping tree crown fractal dimension of the different classifications, we calculated tree crown fractal dimension of the different classifications, utilizing volume occupied by each branch and dry foliage mass of branch from four samples plots in 2003.a new practical method for estimating fractal dimension of a single crown is developed.Tree crown fractal dimension is a useful and practical indice to symbolize tree crown dynamic growth variety.

Key words: tree crown structure, fractals, fractal dimension, tree crown volume, foliage mass