Rapid growth of Cu_10%Pb hypermonotectics and Cu_374%Pb monotectics ha ve been achieved under containerless condition in drop tube. With the increase o f droplet undercooling, the primary(Cu) phase in hypermonotectios shows a morpho logy transition of “coarse dendrite→fragmental dentrite→equiaxed dentrite”. The momotectic microstructure transfers from multiple monotectic cell to single monotectic cell. Corresponding to the droplet diameter changing from 1000 to 100 μm, the calculated maximum undercooling for hypermonotectics and monotectics a re 269 K(02 TLL) and 245 K (02 TMM) respectively. The maximum grow th velocity of (Cu) dendrite is 24 m/s in Cu_10%Pb hypermonotectics. The growt h of primary (Cu) phase is always controlled by solute diffusion. The effect of Marangoni migration is more significant than that of Stokes motion, and the Mara ngoni migration velocity decreases when droplet diameter becomes small.