Abstract:The purpose of this study was to determine if initial spacing and thinning intensity had effects on wood anatomical and physico-mechanical properties of Chinesefir (Cunninghamia lanceolata (Lamb.) Hook.), and if there existed correlations between them.36 trees, about 20 years old, were selected in 1983 from X, Tian tree farm of Anhui Province in eastern China. There are 3 experimental stands which have different initial spacings (3600, 4500, 6000 stems/ha, separately). In 1974, these stands were thinned with 5 thinning intensities (thinning weight according to stems/ha, was 0, 20, 30, 40, 50 percent in turn).Statistical analysis indicated that initial spacing and thinning intensity had significant effects on traceid length, ring width, latewood percentage, basic density and radial, tengential and volumetric shrinkage (P<1%), so did thinning intensity on compressive strength parallel to the grain, rupture strength and modulus of elasticity (P<1%) as well. Effects of initial spacing on these 3 mechanical properties were not significant.5 multiple regression equations were founded between silvicultural practices (initial spacing and thinming intensity) and wood properties (latewood percentage, basic density, compressive strength parallel to the grain, rupture strength and modulus of elasticity). There suggested that proper application of silvicultural practices would improve wood properties.