2004年对六顶山渤海国王室贵族墓地进行了再次复查,确认该墓群的二墓区现存墓葬130座,可分为土坑墓、石构墓两类。而对以往发掘的7座大型石室墓重新清理时,发现了一种全新的墓葬外部结构。从此次发掘的墓葬形制看,二墓区的土坑墓和石构墓可进一步分期。根据墓葬形制与布局,墓群的年代应为渤海前期。 In 2004, the relics of the royal family cemetery in the Bohai Sea of ​​Liuding Mountain were re-examined, confirming that there are 130 existing tombs in the two tomb areas of the tomb group, which can be divided into two types: the tomb pit and the stone tomb. However, when the seven large stone chamber tombs that were excavated were newly cleaned up, a completely new external structure of the tombs was discovered. From the discovery of the tomb shape, the tomb pit and stone tomb in the second tomb area can be further staged. According to the burial system and layout, the age of the tombs should be the early Bohai Sea.