Jiandi Dao was a prefecture of ancient China located around today's Songpan region, in the east of Qingzang Plateau and northwest part of Sichuan

Sichuan

' , known formerly in the West by its postal map spellings of Szechwan or Szechuan is a province in Southwest China with its capital in Chengdu...

 province.
Jiandi Dao was originally founded by Qin

Qin (state)

The State of Qin was a Chinese feudal state that existed during the Spring and Autumn and Warring States Periods of Chinese history...

 (秦) after it conquered Shu

Shu (state)

The State of Shu was an ancient state in what is now Sichuan, China. It was conquered by Qin in 316 BC. Shu was based on the Chengdu Plain, in the western Sichuan basin with some extension northeast to the upper Han River valley. To the east was the Ba tribal confederation. Further east down the...

 (蜀) in BC 316. Han Dynasty

Han Dynasty

The Han Dynasty was the second imperial dynasty of China, preceded by the Qin Dynasty and succeeded by the Three Kingdoms . It was founded by the rebel leader Liu Bang, known posthumously as Emperor Gaozu of Han. It was briefly interrupted by the Xin Dynasty of the former regent Wang Mang...

 reestablished Jiandi Dao in the 6th year of Yuanding (元鼎六年, AD 111). Jiandi Dao was changed to Jiandi County and became a constitute part of Wenshan Jun (汶山郡) in Jin Dynasty.

Di (氐) is an ancient large ethnic group lived in west China which is sometimes considered to be part of Qiang

Qiang

The Qiang people are an ethnic group of China. They form one of the 56 ethnic groups officially recognized by the People's Republic of China, with a population of approximately 200,000, living mainly in northwestern part of Sichuan province....

, called Diqiang. Dao (道) in Qin and Han Dynasty is a kind of administrative unit where mainly settled by primitive tribes.