The thermal stability of FePdB thin films was studied using nonisothermal and isothermal analyses. X-ray diffraction (XRD) patterns indicated that Fe 40 Pd 40 B 20 and Fe 60 Pd 20 B 20 films with thicknesses in the range 25–75Å were amorphous, whereas Fe 40 Pd 40 B 20 and Fe 60 Pd 20 B 20 films with thicknesses in the range 100–200Å exhibited a nanocrystalline FePd (111) structure. The crucial glass forming ability index (γ and γ m ) was determined using the differential scanning calorimetry (DSC) results of amorphous FePdB films. The Kissinger formula was applied to calculate the activation energy (Q) of crystallization for determining the resistance of the films to crystallization. Thermal analysis showed that the thermal stability and incubation time of Fe 40 Pd 40 B 20 are more favorable than those of Fe 60 Pd 20 B 20 .