The ideal first aid method is to save the life and reduce the disability of the patient by rescuing the patient promptly and effectively with bare hands or conveniently with the help of nearby instruments. The Haymlick first aid method belongs to this category. The principle of Haimlich’s first aid method to expel foreign body from trachea is to use the sudden impact on the abdomen, which is the soft tissue under the diaphragm, to generate upward pressure, compress the lower part of the two lungs, forcing the residual air in the lungs to form a stream of air, and this stream with impact and directional airflow is driven straight into the trachea, which can expel the foreign body blocked in the throat and save the person. Liang Yonggui, Department of Gastroenterology, Baotou Central Hospital, often uses the standing method, i.e., the patient is still conscious and can stand, the rescuer holds his abdomen from behind, makes a fist with one hand, puts the thumb side on the patient’s abdomen (slightly above the navel), and holds the fist hand with the other hand, pressing the abdomen with rapid impact, repeatedly rhythmically and forcefully, in order to flush out the foreign body with the formed airflow. The patient’s head should be slightly lowered and the mouth opened so that the foreign body can be spit out. If the patient is in a coma and cannot stand, the patient should be placed in a supine position, with the rescuer kneeling on the ground on the outside of the patient’s thighs with legs apart, hands folded with the heel of the palm of the hand against the abdomen (slightly above the navel) for percussive, rapid, upward pressure. Then open the jaws, and if the foreign body has been flushed out, quickly pull it out and clean it. The first aid method for young children is that the rescuer takes a sitting position and lets the child sit with his or her back on the rescuer’s lap, then the rescuer uses both index and middle fingers to squeeze the child’s upper abdomen backwards and upwards, and relaxes immediately after the pressure. The child can also be placed flat on his back and the rescuer squeezes with the above method. If there is no one present around the patient in an emergency, the self-rescue method can be used. The patient can use his own hand or the back of a chair or the edge of a table to hold the upper abdomen, squeeze it quickly and violently, and then relax immediately after the pressure. Standing first aid method: The rescuer stands behind the patient, surrounds the patient’s waist with both arms, and makes a fist with one hand, and holds the thumb side of the fist against the patient’s upper abdomen (slightly above the navel), and holds the fist with the other hand, squeezes the patient’s upper abdomen violently upward and backward, squeezes the action quickly, and relaxes immediately after the pressure.