After Li Zhi's death, Wu Zetian ordered Yuan Tiangang and Li, the goddesses at that time, to choose the location of the geomantic treasure for the emperor, so that the emperor could leave with peace of mind. They went to many places, and when they came back, they all said that they chose Qi Hao County in Liangshan, which is now Ganxian County. Wu Zetian sent envoys to inspect. At the top of Liangshan Mountain, Yuan Tiangang said that he buried a copper coin here, and Li said that he ordered an iron nail here. After the envoy dug, Li's nails got stuck in the copper square hole buried by Yuan Tiangang. People at that time were very surprised and immediately came back to work for Wu Zetian. So Wu Zetian chose the mausoleum site in Liangshan, which is now the dry mausoleum. The location of Ganling is indeed a treasure trove of geomantic omen, but from this perspective, it is enough to dwarf many imperial tombs.
There is snow where Liangshan is located. The snow can reach 1000 meters, and there is water under the snow. It is difficult to find a mausoleum in this environment. Liangshan has a special geology, and its stone layer is not afraid of earthquake extrusion and will not collapse. When the ice layer later subsided, some sediments adhered to it, which was later buried by dust brought by the wind and covered by new plants.
In other words, the mountains in Liangshan are a whole and are not easy to be excavated and stolen. Coupled with special construction technology, the entrance to its tomb is extremely difficult to find. In the late 1950s, in order to repair the damaged roads, several villagers accidentally discovered the entrance to the cemetery that had been hidden for thousands of years when they bombed the mountains with shells.