There is a close relationship between civil fly-by-wire flight control system and digital bus development. This article simply reviews the development of civil airplane on-board equipment of digital bus, and presents the requirement of civil flight control for digital bus. According to the application analysis on the two typical civil airplane flight control system for digital bus, the characteristics of modern civil fly-by-wire flight control system for digital bus are summarized and a reference for the development of the civil flight control production is given.