Through in vestigation and study vegetation in.the Pu Luong Natural Reserve has classified and described, including 22 units cover two sets of relationships: vegetation natural and the effects pf vegetation. In the forest unit, two units are semi-evergreen forest (and exists in both high and low belt beneath evergreen forest on limestone peaks), evergreen forest remaining. There is a unit-leaved mixed forest with coniferous. A unit of the broad-leaved mixed forest with bamboo, the remaining broadleaf forest.