Why did the ancient pagoda build an underground palace?

Because the underground palace is a cemetery used by monks after death, it is a cellar built under the tower foundation to bury "relics (the remains of Buddhist monks after cremation)". The early Tasheli was placed in the tower and gradually buried under it in the Northern and Southern Dynasties. At first, the treasure letter with relics was buried directly underground, and later it gradually developed into a treasure letter buried in the underground palace. The underground palace is a typical building combining stone carving and stone structure, and it is an important part of the mausoleum building, where the coffins of the dead are placed.