Abstract: The conception and research of the microstructural heredity of the Al master alloy during casting process had been resumed.The effects of microstructural heredity of master alloy on the modifying degree and performance of the final casting were analyzed.The necessary physical conditions of the microstructural heredity effect were summarized.The effect of microstructural heredity of master alloy could be controlled and utilized by selecting optimum raw materials,optimizing the processing technology of the melt,or studying and developing new technology,so the performance of the casted Al alloy could be improved.In addition,the new developing direction in this research area was pointed out.