<p>To further enhance the survival and combat capabilities of attack helicopters, an active optimization method for minimizing infrared radiation of helicopter/engine is proposed. The CFD method is initially employed to acquire the internal flow characteristics and infrared radiation properties of the integrated infrared suppressor. Subsequently, an integrated performance model of helicopters/engine system is established by combining with the thermodynamic model of variable-geometry turboshaft engine and helicopter required power model. Based on the integrated model, the performance optimization modes of minimum infrared radiation, and the minimum infrared radiation with minimum specific fuel consumption taken into account are proposed separately. The corresponding multi-variable, multi-constraint nonlinear programming problems are formulated. The results indicate that in case of the performance optimization mode of minimum infrared radiation, the peak infrared radiant intensity can decrease by over 23% at the optimal main rotor speed, optimal guide vane angles of compressor, and power turbine. Under the optimization mode of minimum infrared radiation and minimum specific fuel consumption, adjusting main rotor speed and compressor guide vane angle can reduce infrared radiant intensity by approximately 25% and decrease specific fuel consumption by about 2% when forward speed exceeds 70&#xa0;m/s. It significantly enhances the helicopter/engine’s infrared stealth capabilities and endurance.</p>