A respiratory rate of 40 breaths/minute, if it is for a short period of time can be regulated by the body’s compensatory mechanism, and has less impact on the human body. If the respiratory frequency is too fast for a long time, it may lead to hypoxia and other symptoms. Human respiratory movement is regulated by the respiratory center, under normal circumstances, the adult respiratory frequency is 12 to 20 times per minute. If the person in the strenuous exercise activities after the respiratory frequency of 40 times / minute, through the rest of the body’s compensatory regulation, can relieve the symptoms of shortness of breath, the impact on the human body is relatively small. If the respiratory frequency 40 times / minute caused by disease, such as pneumonia, pulmonary embolism, chronic obstructive pulmonary disease or asthma and other diseases, may lead to body hypoxia, dyspnea, time can lead to respiratory muscle fatigue, resulting in respiratory failure and so on. If the respiratory rate of 40 breaths/min caused by disease should be actively treated to avoid respiratory failure, resulting in life-threatening.