Abstract:Contents of major chemical components of 9-year-old Eucalyptus urophylla trees with 5 different fertilization treatments were determined.Based on the obtained data,law of effects of fertilization treatments on contents of wood chemical components were analyzed and discussed in detail.Results show that fertilization treatments have no significant effects on the contents of cellulose and lignin,but have extremely significant effects on contents of extractives and pentosan.Fertilization treatments can significantly improve the contents of coldwater extractives,hotwater extractives,1% NaOH extractives and pentosan.And the larger the amount of the fertilizer applied,the higher the content of pentosan.