The homogeneous immiscible Al-Bi alloy was successfully prepared by a cooling slope method in which immiscible alloy was heated over the miscible temperature and then poured into a water bathed copper mould. The acted force of precipitated Bi-rich phase was described during flowing with melt on cooling slope. The results indicate that the Marangoni force

melt drag force and melt flushing force as well as gravity which acted on the Bi-rich phase are acted each other

resulting in the great reduction of the Stokes sedimentation and the Marangoni displacement

which plays significantly positive role for the homogeneous distribution of immiscible Al-Bi in cooling slope. Meanwhile

the temperature of the Al-Bi melt can be remarkably decreased after flowing slope

obviously decreasing the cooling pressure of water bathed copper mould

which have the positive effects of preparation of homogeneous immiscible Al-Bi alloy also.