Heimlich’s first aid method is mainly used for the first aid of foreign body obstruction in the respiratory tract, the object of different operations are different, the specific steps are as follows. 1. Children over one year old and adults. (1) conscious, able to stand or sitting patients: stand behind the patient, a foot placed between the patient’s legs, arms around the patient’s waist, for short children can kneel behind the patient’s head and upper body to keep the patient’s head and upper body tilted forward, one hand clenches a fist, the thumb side of the hand tightly against the patient’s sword protuberance under the umbilicus up two fingers, the other hand clenches a fist, quickly upward to the impact of the abdominal discharge of foreign bodies. (2) Unconscious, unable to stand, sitting patients: let the patient lie down, show the finger to hold the jaw, thumb pressure lower lip, help the patient to open the mouth, to keep the airway open, riding on both sides of the patient’s thighs, overlap the palms of both hands, placed in the umbilicus on the two-finger place, and repeatedly use the root of the palm forward to lower the impact of the expulsion of foreign objects. 2. Pregnant or overweight: unable to hold the patient’s waist can be replaced by chest impact, put the upper limbs under the patient’s armpits, hold the chest, one hand clenches a fist, the thumb side of the two nipples at the midline, avoiding the fenestrae and the lower edge of the ribs, and the other hand clenches the fist backward to discharge the foreign body stamping. 3. Infants: the child is placed in the prone position on the forearm, the forearm is placed on the thigh, the fingers hold the child’s jaw and fix the head, the head is lowered, the root of the palm of the other hand forcefully knocking the scapular area 5 times, the free hand is placed on the back to hold the head and neck turned so that it is supine on the forearm of the other hand, placed on the thigh, the fingers of one hand are quickly pressed on the line of the two nipples for 5 times to use the pressure to increase the discharge of the foreign body. It is recommended to call the emergency number at the same time of first aid to avoid serious consequences of failure of first aid.