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The hereditary effect of Al-Ti,Al-Ti-B,Al-Sr master alloys on the structure and properties of A356.2 alloys was investigated,and comparison analysis between the master alloys used in the foundry industry and the fine-crystalline grain refiners produced by technologies of Samara State Technical University was conducted.The results show that less than 0.5% additions of FCR master alloys can promote 8%～20% in the elongation of as-cast A356.2 alloys.FCR additives are more efficient in comparison with conventional grain refiners and modifiers.Their effectiveness depends on their genetic effect of their finer structures.