Five trees of Chinese pine （Pinus tabulaeformis） were collected from a stand of Zhongtiao Mountains in Shanxi Province. Based on the radial variation of the anatomy features, physical-mechanical properties of the wood, the stemwood may be divided into juvenile wood and mature wood, and the duration of the juvenile period is about 14 years old. The width of juvenile wood and the number of growth rings, decreased noticeably from the base to the top of tree. The volume of juvenile wood decreased in a similar pattern.There are significant differences（0.05Ievel）between juvenile wood and mature wood properties of the trees. Shorter traeheid lengths, smaller tracheid diameters, thinner tracheid walls, flatter fibril angle of the S,2, layer, wider growth ring, lower percent of latewood and higher extractives content, higher specific gravity, lower physical-mechanieal properties are the characteristics of the juvenile wood in comparision with the mature wood.