Abstract: The forest vegetation of Wu-zhi Shan Mt. is provided with characters of tropical forest vegetation: more complicated compositions of plant communities, especially asiatropic compositions of 30.9%, more complicated structures of plant communities; minimal-area 3500~4000m² in the tropical lawland rain forest and 2300~2500m² in the tropical montane rain forest; higher species diversity and evennees (D=5.38 and 5.34, J= 77.8 and 82.6) that a large higher than south sub-tropical broad-leaf evengreen forest; better relationship between forest and environment that is showed by species associations、pattens and frequence lower.
“Down J” model of relationship between stand classes and numbers of species is a character of forest vegetation dynamics. “Down J” model shows that tropical forest have enough new recruitments maintaining the dynamics equilibrium of the climax system.