Its working process is as follows: the flight simulator computer sends a flight simulation data every 5ms and the flight control computer simulator obtains the sensor data from the flight simulator computer every 20ms (only read the latest data). After reading the data, the input data are crosstransmitted among the N channels and the cross-transmission data are also monitored and voted. The "majority voting" data are sent to the control law module which will calculates control law and outputs the control commands. Output commands are cross-transmitted once again, and monitored, voted as well. Finally the output commands are sent to actuator control electronic units (ACE).