In view of the short time and the high cost for the flight test of air vehicle,it is of great significant that the test is successful or failure.Usually in order to ensure the test goes on wheels,the reliability index of the real-time measurement and control software system is above 99%.Aiming at hard real-time and high reliability of real-time measurement and control software system,the great significant of redundancy technology in real-time application to enhance the reliability is discussed.The achieveme...