The advanced fly-by-wire flight control system can greatly improve the maneuverability and stability of civil helicopters, but this novel design also brings huge challenges to safety assessment. Traditional airworthiness standards may not fully cover the design features of fly-by-wire flight control helicopters, and corresponding special conditions need to be formulated to determine whether the helicopter design meets the airworthiness requirements. This article focuses on the four special conditions of civil helicopter fly-by-wire system: interaction of systems and structure, control authority perception, crew alerting system, integrity of command signal and flight envelope protection. First, the technical content of the conditions is given, and then the background and significance of the formulation of the terms are explained. The existing compliance methods and compliance design are given, and the results can provide a certain reference for the airworthiness design and certification of civil helicopters.