The variation in wood properties and the differences between juvenile wood and mature wood of Masson Pine( Pinus massoniana ) plantation from Guangxi were studied. The results are as follows: The boundary between juvenile and mature wood was delimited at the age of 14~16 year. The radial variation patterns of the anatomical properties from pith to bark are: the ratio of ray tissues, ratio of resin canal, cell walls percentage, lumen diameter, wall thickness of tracheid, tracheid diameter, tracheid length,...