Abstract: Studies were made of the plantation density of small wood Eucalyptus grandis (φ8 cm~10 cm) by randomized block design. The results showed that different planting density had no significant effect on the height increment of one to three years old Eucalyptus grandis trees. When the tree age was 3, the planting density had certain effect on Eucalyptus grandis diameter at breast height growth,and with the increase of the density,its diameter at breast height would decrease. The growing stock was maximum when the density was 1 666 trees per hectare. Therefore,the suitable density should be 1 666 trees per hectare when small wood Eucalyptus grandis was cultivated in Guang'an.