Abstract: Studies on the history and size structure of Pinus sylvestriformis population show that the DBH of the population is submitted to normal distribution (N 16.87, 6.08²), being natural population with same age. Its spatial pattern has a higher evenness, and tends to a random or even distribution. The dynamics of distribution pattern shows a transformation from random to even distribution.

Key words: Pinus sylvestriformis, Natural population with same age, Spatial distribution pattern, Random distribution, Even distribution, species biodiversity, canopy coverage, evergreen broadleaved forest, canopy vertical structure