In this paper,stamping-stiffness coupling simulation techniques are proposed,i.e.,stamping,springback and stiffness is simulated with dynamic-explicit FE method,static-implicit FE code, and dynamic-explicit FE method continually.The implement process of three steps and some relative key technical points are listed.The stiffness for a double-curvature box type parts is analyzed by this method.The simulation result is compared with experimental one and satisfied result is obtained.