In this research the effect of Nano-Silver treatment on compressed wood properties, was studied. Wood specimens were cut from Popolus alba (poplar) and impregnated with Nano-Silver and water. Then the saturated samples were compressed through radial direction in a hot press under pressure of 6 MPa, for 1 and 4 hours. The temperatures of press were 150°C and 175°C. Swelling (24h), recovery set and bending strength of compressed samples were tested according to ASTM D-1324 and all data were analyzed statistically. The results showed that the least amounts of swelling after 24 hours soaking in water were seen in specimens which were impregnated with Nano-silver and compressed in 150°C for 1 hour. Also, the least amounts of recovery set were seen in impregnated specimens with Nano-Silver and compressed in temperature of 150°C for 4 hours. The best bending strengths belonged to the dry (non-treated) specimens which compressed in 175°C for 4 hours.

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