The Emperor’s Classic of Internal Medicine, “Su Wen – Wind Theory” says: “Wind is the longest of all diseases, until its change is the birth of other diseases.” Su Wen – Bone and Space Theory also says: “Wind is the beginning of all diseases.” Wind is the main pathogenic factor of the six evil spirits, where cold, wet, dry, hot evils depend on the wind and invade the body, such as external wind cold, wind heat, wind damp, etc., so the wind is often the precursor of external disease. The wind is the main evil that causes external diseases. The wind is the first of the six external diseases, and the so-called six diseases is the collective name of wind, cold, heat, humidity, dryness and fire. The yin and yang shift, cold and heat, climate change have certain rules and limits. If the climate changes abnormally, the six gases occur too much or not enough, or not its time and its gas, as well as climate change is too rapid; more than a certain limit, so that the body can not adapt to it, it will lead to the occurrence of disease. Thus, the six qi transform from harmless to the human body to harmful to the human body and become a factor causing disease.