Abstract: This paper summarizes the application prospect of high order languages (HOL'S) in the future digital flight control systems, and generalizes some problems to which we should specially pay attention when using HOL'S, such as compiler efficiency, target computer architec-ture,software productivity. A Helicopter Attitude Control System is taken as an example, the method of developing the real-time digital flight control operational software is presented by using HOL'S, and also the approach to demonstrating the efficiency of the program written in C language is provided by using the digital simulation and the digital-analog hybrid simulation. It will be useful to follow up the general trend of developing the operational software of flight real-time control systems by means of HOL'S during the 1990s.

Key words: flight control, programming, real-time control, sofeware development, high order language