Influences of different magnetic field intensity and pulsed frequency on solidified structure and mechanical properties of Mg97Y2Cu1alloy reinforced by long period ordered structure were investigated under direct current pulsed magnetic field（ DCPMF）. The results show that morphology and volume fraction of the second phase are changed. When the magnetic field intensity is at 0

0. 25 T

with the increase of magnetic field intensity

primary phase in the alloy is refined gradually

and the size and volume fraction of second phase are increased. When the pulsed frequency is at 1

5 Hz

effects of pulsed frequency on primary phase and second phase can be ignored. With the pulsed frequency increasd to 10 Hz

the desirable refinement effect of primary phase can be observed

and the second phase with the highest volume fraction is distributed uniformly into the matrix. With the increase of magnetic field strength or pulsed frequency

both the strength and elongation of the alloy are increased gradually. When the magnetic field intensity is 0. 25 T

tensile strength and elongation of the alloy are increased by 42. 5% and by 106. 0%

respectively

compared with the alloy in traditional condition.