Abstract: Coupling agent plays an important role in increasing the dispersivity and compatibility between ultrafine Fe₃Al powder and polymer matrix.The single molecular layer saturated adsorption of two coupling agents:stearic acid and A-172 on Fe₃Al powder surface was determined by TG analysis(stearic acid 1.24%,A-172 1.8%）.The reaction mechanism between powder surface and coupling agent was studied with IR spectra.With SEM photography the effects of two coupling agents on the dispersivity of Fe₃Al powder into polymer matrix were compared at this adsorption amount.Coupling agent A-172 is the better choice because it can make ultrafine Fe₃Al powder effectively disperse in polymer matrix.