Effects of borides and Ce-Rich mischmetal on the modification of Fe-rich intermetallics in secondary Al-Si alloys are studied in this paper.Microstructure morphology is observed by optical microscope(OM) and scanning electric microscope(SEM) , phases and compositions of phases are analyzed by X-ray diffraction(XRD)and energy dispersive X-ray (EDS) respectively.Phase transition temperature is measured by differential scanning calorimeter(DSC).It is indicated that borides can prompt transformation from needle-like β-Fe phase to primary α-Fe phase. And the size of primary α-Fe phase increases with the addition of borides. When the borides（KBF4）reaches 1.0%, Chinese script-type α-Fe phase begins to precipitate. Nucleation of Chinese script-type α-Fe phase are based on primary α-Fe phase. Ce-rich mischmetal can inhibit the growth of the primary α-Fe phase and the formation of Chinese script-type α-Fe phase.