In order to improve the radar and infrared stealth effect of the shielding surface, a periodic structure shielding surface with convex and concave is designed by using contour stealth technology. Firstly, four models with different shapes are established to carry out electromagnetic simulation calculation and compared with experimental measurement results, which show that the correlation coefficients between the simulation and experimental data are above 0.9, and the simulation results are accurate and usable. Secondly, the electromagnetic scattering mechanism of each model is analyzed to provide a theoretical basis for the shape design of the shielding surface. Then, the shielding surface with fluctuating characteristics is designed and after simulation calculation, it is found that the reflection coefficient of the shielding surface is less than -10 dB when the convex and concave degree radius r reaches 24 mm, and the reflection coefficient is less than -17 dB when r reaches 28 mm. Finally, the raised part of the shielding surface is filled with thermal insulation material, and it is simulated to be covered on the equipment with an operating temperature of 80 ℃. It is found that the temperature of the shielding surface with thermal insulation material is reduced by 3.5 ℃, which has a certain infrared camouflage effect.