In order to control the multi-step stamping quality of deep cylindrical partsꎬthe effects of drawing friction coefficient f1,reverse drawing friction coefficient f2,drawing blank holder force Q1 and reverse drawing blank holder force Q2 on thinning rates Tmin and Tmax were studied by using the optimization of forming simulation process scheme and the optimization of process parameters by means of mean difference analysis of orthogonal experimental design.The results show that the cracking phenomenon caused by the slow inflow of bending and reverse bending deformation is eliminated after increasing the drawing fillet;after optimizing the trimming line,the " lug" phenomenon caused by anisotropy is reduced.Through the mean difference analysis of orthogonal experimental design and process parameter optimization,it is obtained that the primary and secondary relationship of the factors affecting Tmin and Tmax is f1>Q1>f2>Q2 ,the optimal process parameter groups are f1= 0.200,f2= 0.100,Q1= 60 kN,Q2= 40 kN,and the thinning rate is Tmin= -0.130 3 and Tmax= 0.140 4.The parts have no cracking and wrinkling,and the forming quality has been further improved.It is concluded that this method has good engineering application value for the qualitative and quantitative adjustment of part forming process.