As a critical part of the aircraft engine control system, the design on precautions against inadvertent operation is to prevent the each control for the reverse thrust and for propeller pitch settings below flight regime from being inadvertent operation causing the unsafe events in flight. Comparing the design style of the domestic and foreign aircraft in the precaution for the inadvertent operation, and combining with the analysis of the existing deficiencies and problems in the process of flight with the flight data in the field, a new control mode was adopted with the speed and load signals on the main landing gear to control the flight electromagnetic stop, and a distinct operation on the mechanical stop improved the system reliability.