With the progressively development of Larger Civil Aircraft and Program, a lot of advanced high-safety and reliability, full time and full authority Fly-By-Wire technologies are used to design Flight Control System in order to improve the comprehensive performance. The application of advanced technology also increases the com-plexity and risk for the development and verification of Fly-By-Wire flight control system. This paper researches on flight control system of Boeing 777 aircraft which is one of the most successful commercial aircraft. Based on this research and combined with civil aircrafts actual development, the Development and Verification process mode of civil aircraft flight control system is presented by analysis and summary. Some advantage will be beneficial to develop larger civil aircraft.