The effects of different electro-magnetic body forces on the microstructure and solidifying process of Zn-10 wt%Bi hyper-monotectic alloy under the condition of high magnetic field are investigated in this paper. The result indicate, on the one hand, that the solidified structure is wanted most and the diameter of the second phase particle is minimum when the alternative current (50 Hz) increases to a certain value. On the other hand, the degree of segregation, dispersion and size of the second Bi phase particles in solidified structure of Zn-10 wt%Bi hyper-monotectic alloy are refined significantly with the increase of magnetic induction intensity under a fixed alternative current (50 Hz) value. The analysis result indicates that both the magnetic induction intensity and alternative current intensity have a significant effect on solidified structure so that we can obtain a more competitive solidified structure of monotectic alloy by controlling the intensity of magnetic induction and alternative current.