良好的电磁屏蔽和散热性能是保障电子设备稳定工作的重要因素，5G通信则对电子设备金属屏蔽散热孔阵的设计提出了更高要求。本文通过有限元法数值研究了在1 GHz~40 GHz频段正六边形周期排布金属圆形散热孔阵随散热孔径、金属厚度、入射角度和极化方式改变的屏蔽效能调控规律。结果表明，在保持散热效率不变的前提下，通过减小散热孔径或增大金属厚度可以有效提高其屏蔽效能，并且该性能对入射角度与极化方式均能保持较好的稳定性。该结论对5G通信频段电磁屏蔽设计具有一定的参考意义。 Good electromagnetic shielding efficiency and heat dissipation performance are important factors to ensure the stable operation of electronic equipment. 5G communication puts forward higher requirements for the design of metal shielding vent hole arrays for electronic equipment. In this paper, the finite element method is used to study the regulation of electromagnetic shielding ef-fectiveness of the hexagonal periodic arrangement of metal circular vent holes in the frequency range of 1 GHz to 40 GHz. The electromagnetic shielding effectiveness is adjusted with the change of diameters of vent hole, metal thickness, incident angle and polarization mode of electromagnetic wave. The results show that under the certain heat dissipation efficiency, reducing the diameter of vent hole or increasing the metal thickness can effectively improve its shielding effectiveness, and its performance can maintain good stability to the incident angle and polarization mode. The above results have certain reference significance for the electromagnetic shielding design of 5G communication.