Abstract: Crystallization kinetics of Sm₈Fe₈₃Si₂C₅Cu_0.5Nb_1.5 amorphous alloy has been studied by DTA and XRD methods. Results show that the crystalline phases in the temperature range of 0-1000℃ in this alloy are α-Fe and Sm₂(FeSi)₁₇C_x The apparent crystallization activation energy of α-Fe phase and Sm₂(FeSi)₁₇C_x is 349.53kJ/mol and 316.19kJ/mol respectively. The apparent crystallization aCtivation energy of both α-Fe and Sm₂(FeSi)₁₇C_x is the smallest at beginning, and increases with increasing crystallized volume fraction (X_c). When the volume fraction of α-Fe phase is between 0.2 and 0.6, and the volume fraction of Sm₂(FeSi)₁₇C_x is between 0.06 and 0.5, their apparent crystallization actiVation energies are the largest.