Abstract：A simulation model for stress peen forming of saddle-shaped integrally-stiffened panels was established. Through a numerical simulation-based shot peen forming parameter planning process, the typical panel process plan was simulated and analyzed and an optimized process plan was obtained. The research results show that with the optimized process plan, the simulated deformation of the typical panel is basically consistent with the theoretical deformation. The maximum difference located at the 13th rib of the rear beam is only 3.7mm, which is 8.1mm less than the initial plan. The optimized test plan is used for the test. Compared with the simulated deformation, the differences of ribs 11–17 are less than 4mm. Compared with the theoretical deformation, the differences of ribs 11–17 are not more than 2.5mm, and the differences of ribs 12–16 are not more than 0.5mm. Therefore, the shot peening deformation simulation method is more accurate and the optimization plan is reasonable and feasible.