Abstract: In Parashorea chinensis population there is a great breeding period at intervals of each 3-4 years. During this period the Parashorea can produce about 2000-6000 seeds per tree which is about 30-40 cm in bdh and about 60-80 years old. The seed dispersal range is very limited in a circle of 15-30 meters far from the mother tree. The germination capacity is 68.90 and seedling survival rate 22.35. There are about 0.72 of seedlings growing up, but less than 0.023 of seedlings entering the highest storey in population's vertical strata of the Parashorea. It means that 20 000 seeds are needed for one tree developing into the highest storey. The population of the Parashorea is very difficult to spread because of the seeds concen-trated on a limited range in high density and the high mortality existed in every developing stage of the age clases.

Key words: Parashorea chinensis