Recent progress in eutectic silicon modification of Al-Si alloys was summarized

and application status of the main modifier and key factors affecting modification treatment were reviewed

focusing on influences of modifiers on the porosity in castings and the interaction between modifiers and grain refiners.Recently

the research on the widest used Na and Sr series modifiers is concentrated on the mechanism and solutions on porosity increase in castings caused by modification.The cooling rates and alloying elements are two important factors affecting the modification.The method to improving the modification level of eutectic silicon in multi-element Al-Si alloys at a lower cooling rate is still an important research direction.The nature of mutual poisoning effect between Sr andα-Al grain refiners is the reaction between Sr and refinement particles resulting in efficient content reduction of both modifier and grain refiner.By rational control of content of modifier and grain refiner in the melt and the addition technique

the well-modified eutectic silicon and fineα-Al grains can be achieved.In addition

development of novel Al-（Si）-Sr-（Ti）-B master alloy is also an efficient way to avoiding mutual poisoning.