In order to solve the problem of compatibility between airborne electrical equipment and aircraft power supply system, six corresponding design methods were studies. Four design methods of impulse current suppression, two-way power supply anti reverse current, input short circuit protection and input power-off and discharge were used to reduce the harm of electrical equipment to aircraft power supply system. Two design methods of peak voltage suppression and power supply conversion could prevent the aircraft power supply system from damaging the electrical equipment. For each design method, the design requirements were first introduced, then the mechanism analysis and circuit implementation were carried out, Finally, the device parameters in the circuit were designed, form a universal power supply compatibility scheme. The scheme has been successfully applied to multiple airborne integrated RF system platforms and successfully passed the power supply compatibility test of the system.