Drowning on the brain whether there is damage to the drowning time is determined by the length of the drowning time, the body’s most sensitive parts of the brain to oxygen deprivation, brain oxygen deprivation of 4-6 minutes time, soft tissue can cause damage. If the lack of oxygen exceeds 10 minutes, irreversible damage can be caused. Therefore, the longer the hypoxia time, the more serious damage to the brain. At this time, the airway should be opened promptly and artificial respiration should be performed. Within 4-6 minutes of timely and effective oxygen supply measures, the patient’s brain or other organ damage can be greatly reduced. If more than 8-10 minutes, it can cause some damage to the brain.