Abstract: Global navigation satellite system (GNSS) is the trend of development and application of CNS/ ATMtechnology in civil aviation. The cost-benefit analysis methods for the GNSS non-precision approach and the traditional non-precision instrument approach are given as reference formiddle or small feeder-route aerodromes. The investment cost of constructing GNSS non-precision approach is discussed in detail, and a calculation method forthe economic benefitgrowth ofGNSS non-precision approach relative to the traditional non-precision instrument approach is put forward.