The Burials were made the a unit of the third series of Protected National Cultural Artifacts (重点文物保护单位) by the State Council on January 13, 1988. The area was possibly called "the Western Field of the Ran Valley" (染谷之西原) by the Bohai people, as a Bohai document indicated that is the place where Princess Zhenxiao was buried.
The burial cover an area with the diamters east-west 500 metres, north-south 400 metre. After being made a Cultural Artifacts unit, the protected area expanded to the west 0.5 kilometre to Fudong River (福洞河), west 5 km, north 5 km.
There are three burial zones:
The walls, especially the murals, have been covered with anti-corrosive chemicals. There are also protective personnel on site, so administrative offices were constructed near the Mausoleum of Princess Zhenxiao.