In order to improve the dimension stability and main physical mechanical properties of Pinus massoniana and make good use of it, P. massoniana lumber treated with steam, press dried and surface strengthened with modified melamine-urea formaldehyde resin (MUF) was investigated.The results showed that the MOE, MOR, and compressive strength perpendicular to grain and hardness of the surface strengthened timber were 11 294,831, 43 MPa and 2 479 N respectively, compared with the airdried timber, and the increasing percentage were 75 %, 105 %, 303 % and 90 % respectively. But the abrasive wearability of the surface strengthened timber was worse than the airdried timber. The surface density was 0445 g/cm3 and it was 16492 % bigger than that of internal. The ASE, MEE and RWA of the surface strengthened timber were 8623 %, 5118 % and 3151 %, respectively and its dimension stability was better than that of the airdried timber. So, the surface strengthening did a lot of good to the fastgrowing plantation lumber.
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