There will be altitude sickness in Yunnan, and the average altitude in Old Town of Lijiang is 24 16m. The highest altitude in Lijiang is 5596 meters. However, when the human body quickly enters the plateau above 3000 meters above sea level and is exposed to low pressure and hypoxia, altitude sickness will occur, which is a common disease unique to the plateau area. Lijiang belongs to the southwest monsoon climate of plateau, with low temperature and large temperature difference between day and night. Most areas of Lijiang are warm in winter and cool in summer. The annual average temperature is 12.6℃~ 19.8℃, the hottest monthly average temperature is18.125.7℃, and the average temperature in Leng Yue is 4℃ ~1kloc-0/0.7℃. The annual temperature difference is small and the daily temperature difference is large. The annual maximum temperature is 25. 1 degree and the minimum temperature is -27.4 degrees. May to 10 is the rainy season every year, especially in July and August.