Abstract: In order to investigate the effects of fertilization treatments on wood quality of Eucalyptus urophylla ,this paper deals with volume,growth ring width and gravity of 6 year old E. urophylla .The results are as follows:(1)Growth ring width increases gradually and basic gravity decreases gradually with the increase of growth ring age.(2)Fertilization treatments may significantly promote the growth of 6 years old E. urophylla ;while fertilization treatments of first year not only promote the growth of that year,but also have positive effects on the later growth.(3)Fertilization treatments have no significant effect on average gravity.