The thermoforming experiments on MGH956 alloy sheet are carried out in NC thermoforming machine with heated die under 5 kinds of temperatures and 3 kinds of thicknesses. The comprehensive resilience coefficient of MGH956 is obtained under different forming parameters according to the resilience angles of practical part after thermoformed under different parameters by application of reverse algorithm of general resilience formula. The thermoforming properties are mastered and the optimal thermoforming parameters and resilience rule of thermoforming are obtained according to the experiments and data treatment.