Abstract: With the development of aircraft stealth technology, higher requirements are put forward for electromagnetic calculation. This paper analyzes the technical basis at home and abroad, combs the cut in point and application point of electromagnetic calculation in aircraft stealth performance design, and expounds the analysis contents of electromagnetic simulation in the design process. On this basis, it analyzes the current technology difficulties and future requirements of electromagnetic calculation in aircraft design. Combined with the experience of aircraft development and engineering, the electromagnetic calculation may focus on the fast calculation of super electric large-scale targets and the simulation of stealthy structural materials in the future.