ARINC818 is widely applied in aircraft systems both at home and abroad due to its high bandwidthlow latencynon-compressed Digital Video Interface (DVI)strong anti-EMI (Electromagnetic Interference) ability and light weight.There are high requirements on the safety of avionics systemsso a high-security design of ARINC818 has become one of the most important considerations in airworthiness certification.This paper proposes a high-security design of ARINC818whose validity and feasibility are proved by fault injection and other tests.