Firstly, the mould structure process parameters （relative cutting clearance,the main die fillet radius）were used as the optimized variables and the contour surface with light proportion was used as the optimization objective. Then combining the orthogonal experiment with finite element simulation technology,and taking the circular dropping material of AL2024 as an example, the effect degree and rule of the process variables on the optimization objective were studied . Secondly, on the basis of determining the optimal mould parameters，the relationship of the anti enjecting force size and contour surface with light was investigated. Finally，through verifying the relevant physical experiment，the best parameters of closed extruding fine blanking of AL2024 material were got.