Aimming at the problems of heterogeneous convex ear produced on hot rolled and pickled steel plate for compressor upper shell in drawing forming, the primary and secondary factors affecting the formation of convex ear were obtained by orthogonal experiment. And trimming edge line was solved by using the reverse numerical simulation method combined the theory of the plastic forming and finite element method. The shape of the best blank was gained. For the convex ear defect caused by the anisotropic coefficie...