The minimum unstick speed (V_MU) is defined as the calibrated airspeed at which an aircraft can safely lift off and continue its takeoff without any difficulties. The V_MU flight test, characterized by low-speed and high angle of attack under the influence of ground effect, poses significant challenges and high risks, making it one of the most hazardous flight test subjects in civil aircraft flight test. The research on V_MU flight test methods for civil aircraft is of utmost importance in strengthening the foundation of flight test technology, improving flight test efficiency, and ensuring flight test safety.