Based on density theory of plant growth and related bi ological hypothesis, a theoretical model describing the whole change process of plant population density was derived, i.e. N=exp(aln2+blnv+c) , where N and v represent population density and mean volume of a plant, and a,b,c are parameters. Thereby, the authors proposed a self-thinning me chanism model which can be used in different sites and different growth stages o f Chinese fir plantation, the model was described as N=exp(5.895932H 0.01351034-0.9225263H-0.002829299lnv-0.1148481H -0.01018257ln2v).The simulating result showed that the mechanism mo del f itted the data observed from Chinese fir plantation very well. Therefore it is very useful in practice, which will provide a scientific basis for sustainabl e management of Chinese fir plantation.
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