And it described the research progress of stress wave technique inwood and standing tree at home and abroad.

Theoretical evidence that impact stress wave can travel in standing trees and the research development of using the wave for the detection of mechanical properties of standing trees are stated.

This paper introduces the current research and development on elastic wave tomography technique for detecting internal defects in standing trees.

Nondestructive evaluation(NDE) of wood quality in standing trees is an important procedure in the forest operational value chain worldwide.

However the mechanism of stress wave propagation on standing trees is not well understood and the research in this area is lacking.

In order to make practical non-destructive evaluation on the health of standing trees or to detect the inner defects in logs after tree felling during the winter period,the stress wave velocities propagating in Larix olgensis standing trees under a freezing condition,and the effects of light and moisture content on stress wave velocities were investigated under low temperature(below 0℃).

It holds that establishing a living woods trade market not only can accelerate the development of forestry,realizing prescriptive transform of the forest resources,but also can raise percentage of forest cover and improve the environment,making important effects on the sustainable development of forest resources.

The trade of living woods is the outcomes of commodities economy,the essence of it is the transaction or transfer the possession of the ownership of forest or the woods by compensation.