în this study, the effect of blue-staining on the leachability of CCA elements from CCA-C treated and stained red pine specimens was evaluated. The specimens were first blue-stained in laboratory conditions using Ceratocystis pilifera, C. Iıuntii, C. coerulesceııs, and Aurobasidiıım pııllulans fungi and then treated with 1% CCA-C solution. After fixation period, the specimens were subjected to 336-h of leaching according to modified AWPA Standard method. The blue-staining fungi used in this study had no effect on majör vvood components, hovvever subsequent degradation of ray parenchyma, tracheid vvalls and pits by blue-staining fungi used in this study caused increasing of permeability of vvood. On the basis of ali leached elements, C. pilifera and C. huntii caused somevvhat more leaching of CCA from the specimens compared to percentage leaching rate of CCA in control specimens.