This paper proposes a new intelligent reflecting surface (IRS)-aided electromagnetic stealth (ES) system to enhance the stealth performance of aircraft by reducing or eliminating reflected signals to radar systems. The system integrates an IRS with electromagnetic wave absorbing material (EWAM) to synergize their effects. The optimization problem aims to minimize the received signal-to-noise ratio (SNR) at the radar under the reflection constraints of the IRS elements. A semi-closed-form solution is derived using Karush-Kuhn-Tucker (KKT) conditions, and simulation results show that the proposed system outperforms various benchmarks in terms of stealth performance. The effectiveness of the IRS-aided ES system is demonstrated through comparisons with different reflection designs, highlighting the benefits of phase-shift control in reducing reflected signal power.This paper proposes a new intelligent reflecting surface (IRS)-aided electromagnetic stealth (ES) system to enhance the stealth performance of aircraft by reducing or eliminating reflected signals to radar systems. The system integrates an IRS with electromagnetic wave absorbing material (EWAM) to synergize their effects. The optimization problem aims to minimize the received signal-to-noise ratio (SNR) at the radar under the reflection constraints of the IRS elements. A semi-closed-form solution is derived using Karush-Kuhn-Tucker (KKT) conditions, and simulation results show that the proposed system outperforms various benchmarks in terms of stealth performance. The effectiveness of the IRS-aided ES system is demonstrated through comparisons with different reflection designs, highlighting the benefits of phase-shift control in reducing reflected signal power.