The effects of pruning intensities and pruning seasons on the growth dynamics and the number of epicormic branches produced for a clone I-69 plantation were evaluated at Siyang Farm, Siyang County, P.R.China. Experimental treatments applied in a split plot design included: three pruning intensities (1/3 H , 1/2 H and CK), and two pruning seasons (growing season and non-growing season). Results indicated that difference in leaf area index (LAI) between the pruning intensities was manifested in the year after pruning. The LAIs of middle pruning intensity (1/2 H ) and slight pruning intensity (1/3 H ) were only 49% and 84% of the CK (unpruned trees) respectively. There was no significant difference in DBH and single-tree volume between two pruning seasons and three pruning intensities at 4 years after pruning. However, the number of epicormic branches was affected considerably by the pruning seacons. The number of epicormic branches in the stands pruned in non-growing season was 79.8% higher than that in growing season. The tree height of non-adhering knot was significantly affected by the pruning intensities at 4 years after pruning, 6.0m for the stand with middle pruning intensity, about 4.5?m for the slight pruning intensity and only 2.0?m for the unpruned stand.