Fence introduction: A protective fence of 5,371 meters is set up around the Han tombs. There is a gate in the middle of the south fence and a management room in the middle. There are several trails leading into the gate for visitors to enter the Han tombs. The sealing mounds are arranged in rows from south to north, and in an orderly manner from east to west. Green pines and cypresses and tall willows are planted among them.