Permeating of dyestuff in the wood is of very importance in wood dyeing. Populus tomentosa,Paulownia elongata,Pinus massoniana and Pinus koraaiensis were chosed in this paper to make the experiment of pretreatment in the process of wood dyeing and dyeing technological conditions to the permeable mechanism of dyestuff in the wood. The result shows: The permeability of dyestuff is very different in the different wood species. The permeability of the two softwood samples adopted is better than the hardw...