Abstract: Crystallization dynamics of Sm₅Fe_74.3Nb_1.5Si_11.7B_4.5C_2.5Cu_0.5 amorphous alloy was studied after pre-annealing at 400℃ for 10min.Results show that the crystalline phase in the alloy are α-Fe solid solution and Sm₂Fe₁₇C_x intermetallic compound.The apparent crystallization activation energy of these phases is 557kJ/mol and 514kJ/mol respectively.The activation energy of α-Fe phase is maximal,when the crystallized fr action,X_c is 60%;while the activation energy of Sm₂Fe₁₇C_x decreases with increasing of the crystallized fraction montonically.