In this paper,based on analyzing experiment of Cunninghamia Lanceolata thinnings and the modification treat,the effect of the treating technological pa rameter on the physical and mechanical properties.

Study on the charring process of Chinese fir thinning wood under different conditions by comparisons of FTIR;

Utilization of compressed Chinese fir thinning wood.;

Study on the compression and recovery set of Chinese fir thinning wood;

Sdudy on the compound modification technology of thinning wood of Cunninghamia lanceolata using the ACQ and UF resin;

Micromechanism of carbonization for thinning wood of Chinese fir;

By techniques of one-step and two-step carbonization,capped and uncapped carbonization,with carbon dioxide,nitrogen,oxygen,air and their mixture as atmosphere gas,respectively,pyrolysis experiments on the thinning wood of Chinese fir,one of the fastest growing tree species in Southern China,are carried out.

By analyzing thermodynamics characteristic of fire retardant Chinese fir Thinning,the results showed that the fire retardant can make pyrolysis temperature of Chinese fir thinning decrease and change its original path,cause it to produce char and non flame substance,control the weigh loss velocity and prohibit flaming and afterglowin