In view of the working reliability of the safety actuator under the condition of low overload, a test method for releasing the safety actuator under the condition of low overload was proposed. Based on the flight test of the projectile under the thrust of the rocket engine and the related theoretical calculation and analysis, it is found that the flight overload and the flight time of the projectile are the two most important parameters related to the release and protection of the safety actuator. The results show that the safety release test method of low overload safety actuator is feasible and effective, which can play a certain reference role for the later test.