Abstract: In order to explore the adaptability of the roots and leaves of Amorpha fruticosa L. stoichiometric characteristics to nutrients, and to provide a basis for the study of fertilization and restrict modes of leguminous plants. We used fertilization treatment with three factors（nitrogen（N）, phosphorus（P）, potassium（K））, and three fertilization levels（N1, N2, N3, P1, P2, P3, K1, K2, K3） to measure the carbon（C）, N, P, K content of the roots and leaves of Amorpha fruticosa L. seedlings, and analyze the relationship between elements in the roots and leaves. Our results showed that the leaves had a stronger response than roots under P, K addition, and roots had a stronger response to N addition. Leaf and root N contents, root N/K and root N/P were increased significantly with increasing N addition level, root P/K, leaf P/K and root C/N decreased significantly. Leaf N, P and K content, root P content, root N/K and root P/K increased significantly, leaf N/K and leaf N/P decreased significantly with increasing P application; root and leaf K content increased significantly and root N/K, root P/K, leaf N/K and leaf P/K decreased significantly with the increasing of K application. Leaf C content, root P content, leaf K content and root K content were highly significantly positively correlated, while the relationship between leaf C, N contents and root C, N contents was not significant, while leaf and root N, P, and K contents were significantly negatively correlated with their corresponding C/N, N/P and N/K, respectively. The relationship between the ratio of carbon to nitrogen in leaf and root was insignificant, while the ratio of nitrogen to phosphorus, nitrogen to potassium and phosphorus to potassium in leaf were significantly correlated. The results of membership function analysis showed that in the accumulation of C, N, P and K contents of Amorpha fruticosa L., N2 was the best treatment. N addition resulted in P limitations to leaves and roots; P addition resulted N limitations to leaves and roots; K addition did not changed the limitation patterns. These results can provide a good basis for rational fertilization and scientific management of Amorpha fruticosa L..