The geometric topological structures with different structural parameters are designed, and the electromagnetic shielding effectiveness of each geometric topological structure is compared and analyzed. The infrared transmittance formulas of each geometric topology are established and verified by computer image processing and experiment. The high frequency structure simulation software(HFSS)is used to simulate each geometric topology, and the electromagnetic shielding effectiveness of different geometric topologies in 12～18 GHz band is obtained. By comparing the electromagnetic shielding effectiveness of different geometric topological structures, the geometric topology with the highest electromagnetic shielding effectiveness under the same conditions is determined. The object of cross topology is obtained by lithography, and its electromagnetic shielding effectiveness is tested by network analyzer. The test results of cross topology show that the difference between measured and simulated electromagnetic shielding effectiveness tends to increase when the frequency increases.