First, the cause of death by drowning is mainly the inhalation of large amounts of water in the trachea to prevent breathing, or due to strong spasms of the larynx, causing the closure of the airway, asphyxiation death. Second, the symptoms of drowning, facial bruising, swelling, bloodshot eyes, mouth, nostrils and trachea full of bloody foam. The limbs are cold, the pulse is weak, and even convulsions or respiratory and cardiac arrest. Third, self-help and rescue When drowning occurs, not familiar with the water can take self-help method: in addition to calling for help, take the supine position, head backward, so that the nose can be exposed to the water surface breathing. Exhale to shallow, inhale to deep. Because deep inhalation, the body specific gravity to 0.967, slightly lighter than the water, can surface (exhale the body specific gravity of 1.057, slightly heavier than the water), do not panic, do not lift the arms up fluttering, and make the body sink faster. Swimmers, if calf cramps occur, to remain calm, take the backstroke position, bend the toes of the cramped leg to the dorsal side with your hands, can make the spasm loose, and then slowly swim to shore. To rescue a drowning person, swim quickly to the drowning person, observe the position clearly, and rescue from the rear. Or put into the board, life ring, long pole, etc., so that the fallen person climbing support to shore. Rescue after the water: first clean the drowning person’s mouth and nose sludge, sputum snot, remove the dentures, and then water control treatment. Ambulance personnel single-legged knee, the drowning prone on the lap of the rescuer, the position of the drowning body water from the trachea oral discharge (Figure VIII). Some rural areas will be drowning prone across the back of the cattle, head and feet hanging, driving cattle walking, so that the water control, but also play the role of artificial respiration. If the drowning breathing heartbeat has stopped, immediately mouth-to-mouth artificial respiration, while chest cardiac massage.