Infuluence of adding Al to Fe-13Cr magnetic alloy on the magnetic properties was investigated in the direct and alternating field. With increasing sintering temperature, the coercive force decreases and the magnetic flux density increases in regardless of Al content. Thus the magnetic property in the direct field is improved. This may be due to the increase of the density. Under the alternating field, on the contrary, the amplitude relative permeability decreases at higher frequency with increasing sitering temperature. On the other hand, the magnetic property in the direct magnetic field deteriorates with increasing At content at the fixed sitering temperature. In the alternating field, on the contrary, the amplitude relative permeability unchanges below 2% Al content, but above 3% content the characteristic seems to improved. But the improvement of the magnetic property in the alternating field with Al content as the previous study for the melting alloy. It is presumed as the reason to be not enough to the sintered density.