Abstract: Three densities for planting experiment of Mytilaria laosensis plantation have been studied. The result of experiment showed that the planting densities have not significant effect on the tree height growth in the early stage of young plantation, but it has significant difference in the growth of D.B.H (Diameter Breast Heigh). The crown diameter and the root system have highey positive correlation with both D.B.H and tree volume, but highly negative correlation with tree bole of under crown length. Total growing index in different densities in 3×2m2×2m1×2m, in the former (i.e. largest spacing) which, uniformity of forest physiognomy, occupied a considerable proportion of trees of larger dimeter classes, higher in available timber. Under the natural prunning, the largest spacing obtained the best effect after five years. It is suggested that the 3×2m is the most suitable density for the Mytilaria laosensis planting.