Abstract: The present work explores the feasibility that the age forming and friction stir welding technology are used in large aircraft integral panel production. The numerical modeling method with welding unit is proposed. The principle of this method is that shin Aluminium alloy 2A12 is used to test in uniaxial creep tensile. Furthermore,the constitutive model with materials constants is obtained, which can describe accurately the material creep deformation. Based on the simplified elastic-plastic constitutive relation on the ANSYS environment,the analysis model of the integral panel with welding unit is established to simulate ageing forming process and spring-back process. The variable principle of equivalent stress with ageing time and the displacement distribution after the ageing forming spring-back are acquired,and the accuracy of digital computation are verified by the experiment in a specific high temperature.