The well is well-shaped, the diameter of the well is 0.5 meters, surrounded by stone carving railings, a thick chain is bolted on the railing, meaning "the lock of the well". Regarding the "the lock of the well", there is also an ancient legend. It is said that there is a "black dragonfly" in the East China Sea during the Daqi era, called Wuzhiyu (no branch). It wanted to be the leader of the day, and repeatedly asked for a request to be severely rejected by the leader. Choose Daqi as the leader. The witch branch is grudged, to revenge the dragonfly, remove the dragonfly. After the dragonfly died, the witch branch tried its best to fight the dragonfly. He made the East China Sea fish and fins to flood the village and flood the mountains. Da fin led the people to control the water day and night, and he had three families and did not enter. He transferred the homeless people to Mount Tai, Xinglong Mountain, and Longdong Mountain. Da Xuan is carrying a demon mirror, with a sea needle, arm in arm, and fighting with the witch branch in the wind and waves by logging. He throws the demon branch, knocks the witch branch over the ground, and locks the witch branch in the well. So there is a chain at the well's mouth!