The authors impregnated radiata pine（Pinus radiata,from New Zealand）logs with a modified urea solution to improve lumber performance,sawed the logs into dimensional lumber after chemical treatment,and then densified the lumber with a multilayer press at 90 ℃ in a drying kiln.The densified lumber bending strength,modulus of elasticity,compressive strength parallel to wood grain,and drying qualities were improved considerably and met the specification of the Chinese national standard GB/T 6491-1999 for second grade lumber.