Abstract: West Liao is a dynasty established by an ancient tribe,the Khyattan,in the north of China.The dynasty ruled the western Sinkiang and Central Asia for ninety years (1132—1218).During the period,Khyattan people were becoming from a nomad people to the resident agriculture people.On the base of the government of the local rulers,they established their system and policy.Their rule accelerated the economy and the culture of Central Asia.

Key words: Khyattan, West Liao, nomad people；resident agriculture, Shahna