Extreme low altitude flight plays an increasingly important role in the military and civilian fields, and has been widely applied. Through the analysis of the characteristics of the extreme low altitude flight navigation, this paper puts forward the specific contents of the preparation of the navigation before the flight, the precise implementation of the method of extreme low altitude flight navigation, and the matters needing attention in the flight. It is of great significance to carry out the ability training of flying personnel in extreme low altitude flight, to maximize the performance of aircraft and equipment, and to complete the mission of flying.