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Combined with the characteristics of modern aircraft , which has Complex functions, many kinds of equipment, large number of equipment, large scale of electrical system, complicated interdevice connection and many interface signal types , For high anti-interference performance and reliability requirements , the types, characteristics and influence of interference sources, such as radiation, power supply crosstalk, surge and crosstalk are analyzed systematically . In view of the influence of circuit conduction, radiation, differential mode and common mode interference four interference pattern, the design method was put forward in four aspects from the source to improve the suppression of complex aircraft electrical system anti-jamming performance and precautions , which is grounding design, shielding design, isolation design and filter design. Finally, combined with typical cases, the problem of signal interference in the electrical system of an aircraft is analyzed, which is solved by adding isolation measures and verified by experiments.