On its left side are 24 lines of old Tibetan language. On its right side are 19 lines of Buddhist prayers.
Shargan Wangdue said most scholars agree that the stele was set up in 826 or 838, during the period of Tubo kingdom.
"This stele shows Buddhism was already being practised during the Tubo period in western part of Ngari," Shargan Wangdue said.
The bed, 2.55 meters long, 1.3 meters wide and 1.8 meters tall, is the oldest and the best-preserved lacquered bed ever unearthed in China, said Yang Tao, an assistant researcher with Chengdu Cultural Relics and Archaeology Research Institute.
The bed was unearthed in 2000 in a tomb complex discovered in Chengdu, capital of Sichuan.
"Parts of the bed were scattered in a number of boat- shaped coffins at the time of the discovery, and it took archaeologists and their staff 17 years to restore the bed to its original form to the best of their ability, using various techniques," said Xiao Lin, who heads the restoration department of the institute.
"Based on its structure and patterns, the bed is very likely to have been used by an ancient king of Shu State, who ruled the region in the early Warring States period 2,500 years ago," Yan Jinsong, an archaeologist who headed the excavation work of the tomb complex said.
"The signs that makers left on the bed are highly related to the language used in the Shu State, offering new and valuable clues to archaeologists keen to decode the mysterious ancient language," he said.