Surface densification and post-heat treatment were used to improve the dimensional stability of Pinus yunnanensis samples.The process involved hot pressing for 10 minutes under 150 ℃ and then heat treatment for 2 hours under 180 ℃ or 220 ℃.The results showed that hot-pressing to densify the surfaces was an effective way to improve surface hardness and bending property of samples.Heat treatment for these surface densified sample could improve their dimensional stability considerably,such as,equilibrium moisture content,water absorption,thickness swelling,but decrease their modulus of rupture slightly.