The site ruins of Tangya Tusi City in Xianfeng County of central China's Hubei Province.

The 39th session of the World Heritage Committee will be held from June 28 to July 8, in Bonn, Germany, where the Chinese Tusi site ruins will be jointly applied for world cultural heritage by the provinces of Hunan, Hubei and Guizhou.

It is expected that more than 1,000 representatives from 191 countries will attend the session. There will be 41 projects submitted and reviewed.

The three Tusi relics include the Hailongtun castle in Zunyi, Guizhou Province, the Tangya Tusi city in Xianfeng County in central China's Hubei Province and the Yongshun old Tusi city in central China's Hunan Province.

Tusi also known as Headmen or Chieftains, were tribal leaders recognized as imperial officials by the Yuan, Ming, and Qing-era Chinese governments, principally in Yunnan. The arrangement is generally known as the Native Chieftain System. The system originated from Yuan accommodations following the conquest of Dali in AD 1253 by Mongol forces under the command of Kublai, the brother of the Great Khan. On 23 January 1953, the People's Republic of China (PRC) established the Xishuangbanna Dai Autonomous Region and ended the native-chieftain system.