To effectively control the morphology of TiAl3 compound particle in microstructure of Al-Ti-B wire, effects of different electromagnetic stirring time and temperature on the size, shape and distribution of TiAl3 phase during electromagnetic stirring and CASTEX deformation of Al-Ti-B melt were investigated by OM （optical microscope）, SEM （scanning electron microscope） and XRD （X-ray diffraction）. The results show that with increasing in electromagnetic stirring time, the conglomeration of TiAl3 phase disappears, and particles are broken and refined with uniform distribution. Desirable refining effects can be observed at 300 min. Stirring temperature directly control the viscous force. With increasing in temperature, aggregating band of TiAl3 phase disappears with the improvement of particle distribution. Desirable electromagnetic stirring temperature is 800℃.