In order to solve the problem that the application of less mature technologies increases the development risk in the development of civil aircraft high-lift systems with high safety and reliability requirements, combined with engineering data, on the basis of airworthiness safety design and analysis methods, a development technology is established. The risk identification method takes a civil aircraft high-lift system as the object, identifies the technical risks affecting its safety, and gives the technical improvement method and risk control strategy. The results show that there are risks in the uncommanded release of the flaps and the uncommanded retraction of the flaps in a high lift system of a civil aircraft. The probability of failure is reduced from 1.656E-09/flight hour to 9.424E-10/flight hour, which meets the system safety requirements and avoids risks.