The Heimlich maneuver can be applied to adults, infants and young children, unconscious patients and self-rescue, the principle is that by impacting the upper abdomen, so that the residual gas in the lungs to form a stream of air rushed into the trachea, to promote the expulsion of foreign bodies. 1. Applied to adults: the rescuer stands behind the patient, wraps his arm around the patient’s waist, makes a fist with one hand, puts the eye of the fist on the umbilicus in the position of two horizontal fingers, grasps the fist with the other hand, and impacts the fist upward quickly, and repeats the above maneuvers until the foreign body is discharged. 2. For infants and young children: the rescuer fixes the child’s head with one hand, so that the child rides on the rescuer’s two thighs, face upward, and then puts the middle or forefinger of the other hand on the midpoint of the line connecting the child’s two nipples, and then presses the child with gentle and fast upward impacts, and repeats the above maneuvers until the foreign body is discharged. 3. Apply to unconscious patients: make the patient lie down, the rescuer crosses the patient’s outer thighs, puts one hand on the other, puts the palm of the following hand on the umbilicus with two transverse fingers, and exerts force to the patient’s back and upward with quick impacts, and repeats until the foreign body is discharged. 4. Apply to self-help: you can make a fist with one hand, the other hand wrapped fist, in the umbilicus on the position of the two horizontal fingers of the rapid upward impact pressure on their own abdomen. Or, with the help of a fixed object with horizontal edges, bend over so that its edges press on the upper abdomen, rapid upward impact, and repeat until the foreign body is discharged. The Heimlich maneuver has saved tens of thousands of lives to date, and should be remembered and used in the event of an acute respiratory foreign body obstruction in oneself or others in the immediate vicinity.