This article investigated the relation between the structure morphology and casting conditions of A356 aluminum alloy casting. With the help of structure analysis and computer simulation of cooling rate

the quantitative relation between eutectic content and cooling condition was studied. The results showed that the eutectic content in the solidification structure was increased while the cooling rate of casting increased

the evolution of primary phase was from coarse dendritic to rosette dendritic

We can precisely predict the cooling condition in different positions of the casting by computer simulation

and provide a kind of reference for the prediction of the microstructure and property in the different locations of casting. These lay the necessary foundation for the development of casting parts with complex shape and varied demands.