Research on nutrient diagnosis and fertilization of forest seedling are necessary for reasonable fertilizer application.It also can be an important scientific basis for improving the quality of seedlings and the afforestation survival rate.In this study,one year old Chinese fir seedling was selected as the test materials for its economic value and fast growth.The experiment was carried out in the state owned forest farms in Fujian Zhangping.The laboratory simulation was conducted in different soil nutrient conditions,using the fertilization method of quadratic general rotary design.The production of Chinese fir biomass was divided into various levels before using DRIS nutrition diagnosis graphic and index method.These methods were used to calculate the appropriate range of fertilization in different fertilizer order.The resulted showed as follows:The suitable ratio range among N,P,K nutrients for the Chinese fir plant were P/N=0.137±0.03,N/K=1.102±0.113 and K/P=6.881±1.203.The best equilibrium of nutrients sets in group 7(in which nitrogen was 0.511 g/pot,phosphorus content was 0.270 g/pot,and the amount of potassium was 1.339 g/pot).Overall,the fastgrowing fir demanded mostly for K,and then followed by P and N.