Abstract: With the low-melting-point Wood's metal used, how the PMF (pulsed magnetic field) affects the fluctuation behavior of melt meniscus in PMF was investigated, where the melt was stirred with the peripheral electromagnetic force to form a vertex, while the radial electromagnetic force formed a liquid cylinder and vertex at the central part of melt if the force played a role of compression and tension, respectively. Moreover, the Sn-20wt% Pb alloy was applied to investigating the effect of the PMF on the quality of billet. The results showed that the microstructure of the alloy is obviously refined with the surface quality of billet improved greatly. Also, under the experimental conditions, when the pulsed discharge frequency is 3.9 or 6.6 Hz, a resonance occurs on the surface of molten metal so as to accelerate the flowability in the melt, thus enhancing the grain refining effect of the PMF.