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Exposed protrusion can increase the RCS of aircraft. However, low cost and conformal design are contradictory. Stealth design based on the existing exposed protrusion to the low cost and standard stealth of aircraft is discussed. Configuration optimization of exposed protrusion, coating of wave-absorbing material, upgrade of fabrication process can reduce the RCS of low-cost aircraft. The RCS values are obtained under different frequency and polarization through simulation and other test methods, which are compared to verify the effectiveness of the method,also provide a base and a means for other exposed protrusion stealth design.