Forest canopy is regarded as the most direct and active boundary between the forest and its outer environment.At the same time,it also reflects the results of competitive process of woods growth and development,and the adapting strategy to environment.However,little information is currently available about plant canopy characteristic under different management measure.In order to find out more about the change and adepted characteristic of canopy structure under the structure-based forest management,we studied the Platycladus orientalis Plantation lied on Jiu Long mountain.