研究了８年生杉木无性系试验林的树高、胸径、材积和木材密度的遗传变异规律。结果表明：试验中各性状在无性系间存在显著差异，遗传变异系数树高为９０％，胸径为１３７％，材积为３００％，而木材密度只有６７％，各性状均有较高的重复力，木材密度和胸径的重复力在９００％以上。树高、胸径、材积３个生长性状间有较高的遗传正相关，而胸径、材积与木材密度间表现出中度的遗传负相关，树高与木材密度间则表现出弱度的遗传负相关。采用简化的指数选择法评选出４个优良的无性系，材积现实增益２５５２％，遗传增益２１０５％，用木材密度与ＣＫ相近。 The genetic variation of tree height, DBH, volume and wood density of 8-year Chinese fir clonal plantations was studied. The results showed that there were significant differences among clones in the traits. The coefficient of variation of tree height was 90%, the diameter at breast height was 137%, the volume was 300%, while the density of wood was only 67% Traits have higher repeatability, wood density and DBH repeatability of more than 90  0%. There was a high genetic positive correlation between tree height, DBH and wood volume, while DBH, wood volume and wood density showed moderate genetic correlation, while tree height and wood density showed weak genetic heritability Related. Four excellent clones were selected using a simplified index selection method. The actual gain of material volume was 2552% and the genetic gain was 2105%. The density of wood was similar to that of CK.