The Hongyuan grassland is particularly mysterious because it is located in a high altitude area of more than 4,000 meters above sea level. The grassland is also an average altitude of 3,400 meters. In the 7-8 hour drive, all the way to the hills and hills, the height difference is relatively only 50 to 60 meters. But in the wide plateau of the valley, clouds, wind direction and climate change are many sections. This area passed by the Red Army Long March at an altitude of 3,800 meters. Monuments are now built