Since the Han Dynasty, Ruili has become an important place for jade trade between China and Myanmar. At that time, it started from Chengdu, Sichuan, entered Zhaotong, Yunnan via Yibin, passed Xiaguan (Nanzhao and Dali) to Mengmao (Ruili) in Dehong, and entered Muse, Nankan, Pagan and Central Asia from Gao Jie, Myanmar. The other one entered Pagan Emerald Production Area in Myitkyina, Myanmar from Tongbiguan in Yingjiang County, Dehong, and then went directly to India and Central and Western Asia, forming a "Southern Silk Road". This "Southern Silk Road" is hundreds of years earlier than the "Northern Silk Road". At that time, along this "Road of Poisoned Bodies in Shu", caravans and elephant teams (in the 4th century BC, the area ruled by the Dai people was called "Elephant Country", with its capital in Mengmao Town, Ruili, 20 13) came in an endless stream, and a large number of jade velvet were trafficked. During the nearly 500 years from the Ming Dynasty to the later period of War of Resistance against Japanese Aggression, almost all the jade velvet mined in Myanmar was transported to Ruili (the capital of Gumengmao) and Tengchong, and only a part of it was polished locally. Then the soldiers were divided into three roads, all the way east, passing through Dali and Kunming; Part of it enters Chengdu from Yibin, Sichuan, or is shipped out from Yibin via the Yangtze River and then exported to the mainland and coastal areas; Part of it was shipped to Dongmeng, Chiang Mai, Thailand. At that time, jade was not only a treasure and living ornament of Meng Maoguo, but also a tribute of the Western Han Dynasty and the Ming Dynasty. At that time, these jewels and jade articles could not be traded as ordinary commodities. These rare green stones were called jasper in the Ming Dynasty and emerald in Yongchang County, western Yunnan. China's princes and grandchildren regard it as a treasure, competing to wear decorations, which has become the difference between rich and poor. Some also use jade as decoration to distinguish official ranks. Until the middle of the Ming Dynasty, Emperor China sent eunuchs to Luchuan (Ruili) in Yongchang County to purchase jewelry and jade articles. At the end of the Ming Dynasty, Zong Tianqi's "Yunnan Record" contained: "The official gave the capital, and the people collected gems and entered the official." With the cooperation between the government and the people, a large number of Mongolian jadeite entered China at that time (Meng Gong and Pagan jadeite producing areas under the jurisdiction of Mengyang in Myitkyina, Myanmar at that time belonged to the ancient Mongolian jadeite kingdom).
To sum up, Meng Gong and Pagan, the jadeite producing areas in Myanmar (Mengyang), were once under the jurisdiction of the Dai people in Mengmao. Historically, Ruili is not only the source of jadeite in China, but also the main channel and distribution center for jadeite to enter China.