The solidification microstructure of Fe-49%Sn and Cu-40wt%Pb monotectic alloys was investigated under a high magnetic field. The results show that some of aligned solidification structure were formed in the alloy of Fe-49%Sn and Cu-40wt%Pb under high magnetic field. In Fe-49%Sn alloy with 10T high magnetic field

the difference of magnetic anisotropy energy in αFe crystal orientations and the preferential growth of αFe dendrites induce the formation of aligned Fe-rich dendrite phase paralleled to the applied high magnetic field

and the diffraction intensity in αFe （110） crystal face is apparently increased. In Cu-40wt%Pb alloy with 12 T high magnetic field

the motion of Pb-rich droplets and the melt flow in the solidifying front was restricted by high magnetic field

that induce the formation of much longer

regularly aligned rod-like Pb-rich phase in the sample center.