Abstract: The structure and pouring system of the electric vehicle ZL210A aluminum alloy power battery pack were designed. Based on ProCAST software, a simulation model of precision casting of aluminum alloy power battery pack was established, and the solidification, shrinkage and porosity characteristics of precision casting of power battery pack were studied and analyzed, and verified by experiments.The results show that the designed gating system of aluminum alloy power battery pack is simple, and it is can accurately control the flow of alloy liquid, filling time and solidification temperature; the aluminum alloy power battery pack castings basically show a symmetrical distribution throughout the solidification process, and the sum of the simulated shrinkage porosity and porosity of the battery pack precision casting is 3.68%.The average value of the total shrinkage porosity of the test casting is about 3.72%, which is basically consistent with 3.68%, confirming the accuracy of the simulation results.