Introduction to Aobao: In the minds of herdsmen, Aobao symbolizes the presence of God in his place and is passed down hereditary. On the endless grassland, you can often see huge piles of stones made of large and small stones with willow branches inserted on them. These are called sacred trees, and colorful sacred flags are inserted on the sacred trees. Huge piles of stones stand on the grassland, and bright sacred flags are like arms calling to the shepherds in the distance. Every time the herdsmen pass by Obo, they must place a few stones; every time guests come to Obo, they usually wrap it three times clockwise according to Mongolian custom, and at the same time make a wish in their hearts, and add stones to Obo to hope that their wishes will come true. Generally, 3, 6, or 9 stones are thrown, and the symbols are six or six, good luck or good luck, etc.