The numerical simulation was applied to analyze the filling and solidification process of Al alloy cabin body in counter-pressure casting process.The results indicate that it is difficult to achieve a smooth and layer-by-layer filling pattern by using traditional vertical slot-type pouring system as a result of the splash and rollover of liquid metal.Consequently

the pouring and feeding system was improved based on the simulation and theoretical analysis.The adoption of ring-shaped slot pouring system can improve effectively the filling quality

and a reasonable solidification sequence can be obtained by enlarging the ribs and utilizing the chill blocks combined with top riser.Furthermore

the pressure-holding time was shortened to increase the productivity based on simulation results.