A bucket spring is a natural stone spring, because of its small flow, can only hold a bucket of water named. The architectural layout of yidouquan is very ingenious, varying from low to high according to the ups and downs of the mountain. The main building of a bucket of spring for the hole true palace, for the Taoist yuan shi tian zun of the dojo. Tang yonghui two years (651 years), tang gaozong li zhi sentiment mianshan protective li tang dynasty, ordered the restoration of the hole really palace. The hole is 20 meters high and covers an area of more than 500 square meters.